Apart from the damper being upside down like everyone else pointed out, it's worth mentioning that the bottomless tokens are installed ABOVE the upper seal, not below. Like in the damper stanchion, the chamber above is connected to the main spring chamber by channels. That's why the tokens are only limiting the air volume without changing the actual travel of the fork.
You had your damper cylinder upside down. The compression adjustment is on the top. That is why that giant air bubble was mixing with the oil. That actually hurts damping performance. If the cylinder was the right way up, the air would have been above the compression piston, and the air would not mix with the oil.
Yeah look at 12.08 aswell whare he's saying the volume tokens go! Half way down under the seal 😂 geez this video's most confusing ever needs to be remade
hey, i'm brazilian and i really aprecciate this video, bcz here in youtube brazil, there isn't videos explaining how this type of suspensions works. Thank you boy, success to you!
Really good explanation. It has been difficult for me to find that kind of video. And really clear even for a spanish talker like me. Now I can clearly understand how does the fork work.
Excellent video 👍👌👏!! Thank you! Im returning to serious MTBing after 20 years away... hahaha the last suspension I saw the inside of was the 1998 base model Rock Shocks (was it a Judy? ...me thinks yes!) They were toys back then...plastic air springs both sides...this is completely different. This is easily as sophisticated as the Ohlins motocross suspension I used to use on my dirtbikes. Now I understand the cost, and see the value...even if other companies have different methods to achieve the same things those things are really being addressed (Hi/Low speed compression and rebound dampening) My hope was to see this level of sophistication and I am not disappointed. thanks again
Grrrreat tutorial! Finally someone who took the job really seriously and got us, forknerds from oblivious bumping over trees to scientifically supported cruising through the woods :D Love the dummies!
Pretty straight forward analogy for explaining bike suspension from rider's perspective and good job for the demonstration of suspension parts! However, there are some points need corrections or better explanation to not misleading non-suspension enthusiast viewers. 6:16 That is the upper part where the compression or lock-out knob located (at your hand reach when you ride). 10:29 I think you wanted to refer to the dimple on the wall of air-spring cylinder tube which has main job is to balance the pressure between positive and negative chamber. Some forks will need a bit of cycling the fork to equalise the pressure, but some new forks nowadays may not need to. Some claim that having dimple at zero travel can affect small bump sensitivity... 11:03 The polymer spacer (Topout bumper) in the negative spring chamber is supposed to work as cushion when fork fully extended. (I'm not sure if this scenario is called 'off the top'?...please correct me if I'm wrong) For bottom-out cushioning, some forks has polymer spacer in lower leg to take the hit from stanchion, some cheap coil spring forks has polymer rod in the positive spring chamber to do that task.
Also makes a good case for the latest damper designs from Fox and Rock Shox using bladders or sealed chambers separating the oil from the air and preventing the foaming or "cavitation" which may lead to unpredictable dampening characteristics.
This was so amazing for me to watch and learn from! I had no idea that each of the front forks do different things! Engineering is so awesome! I live in india, i am 44 years old, im new to current MTB tech although ive been oggling all these youtube videos for years now. I used to cycle more than i walked during my schooling days. My bicycle was called the StreetCat RockNRoll ❤😂 The coolest bike available in the 90s in india 😅 Cool dad i have! I still havent ridden a 27.5. I stopped a stranger and rode his 29er recently, felt like i was riding a horse, so awkward!! 😂 I'm traveling to thailand and excitedly waiting to ride a cycle trail and hopefully pick up a frame and suspension and cranks to build a cycle cheaper than they sell in india. I ride agressive street, like climbing down stairs and wheelieing and well not stoppies anymore cuz im freakin 80kgs now (still very fit though). I guess my reason for rambling is im hoping to find hints and suggestions for minimum requirements for my dream cycle build. Okay, sorry for rambling! Thank u for this excellent video!
It works in the same way as the compression adjustment. It just completely closes off the valve that allows the oil through to the other chamber, rather than having it still open slightly, thus no compression at all so the fork wont move. There was a video that had Jordi Cortes from Fox explaining how it works, but i cant seem to find it.
As some folks has said, you explain the rebound side upside down, the compresion knob is the upper one, and the rebound knob is lower one, near the drops
Great video, very nice explanation However you kind of messed up the damping side of the fork...what i mean is that you explained it upside down...rebound is on the downside and compression on the upside (lookout is always on the top, rebound adjuster on the bottom) You can also see it at the rod sticking out of the damping unit...it connects with the lowers via a screw, whereas the other side is screwed into the forks crown. So everything is alright, expect you have the damping side turned upside down in your explanation and in the background : )
Please don't let this be true...in every other discipline his explination is correct, why would it be different for mountain bikes? Think of the physics, when the forks compress it's called... Compression. To lessen said compression or to dampen it would be the compression dampening adjustment no? then when the fork is kicking back against the compression is called the rebound and to lessen that effect is the rebound dampening (er)?
@@matt-g-recovers yeah nothing wrong with his explanation, he just held it upside down. In assembled fork it would be turned around, so that the compression adjuster is on the top and the red damping adjuster at the bottom of the fork. Otherwise everything is correct and perfectly explained :)
Springs that are made with a uniform thickness rod will have a linear characteristic. This tweaked to give a spring a progression characteristic changing the pitch of the coil wind and by heat treatment. The true progressive spring will be made by using a tapered rod, one where the rod is slightly thicker over the length of the rod coiled to make the spring too changing the pitch of the spring coil to a smaller pitch at the end where the ticker material is coiled will vary the spring compression progression depending where the pitch changes. If the pitch starts halfway through the spring and the pitch progressively decreases over the remaining length. The the spring will have a linear characteristic for the first half of the compression but will require greater force the more it is compresses beyond the halfway point.
Great video, but it does not mention an important part - explaining how negative and positive chambers work and what are they used for :) It's a very interesting topic, and I guess DualAir shocks are really great, allow you more adjustments and less sag
The best explanation i0ve found. Thanx :D I guess the rear suspension's are the same... Air & coil. it would be great to have thos models with transparent cases to view the inside of the forks and the rear shocks :D
Right, I have a question. Why these two tubes and two pistons cost $1200 sometimes? I see no room for expensive manual manufacturing. Each piece is made automatically, and an assembling does not require a sophisticated routine.
@@hermanngerman5805 Exactly this is similar to a price difference between 64GB and 128GB. I'm far from thinking that a bike is an iPhone ) For me it's ok to take a China carbon, place a "Canyon" sticker and use it until it dies. No problem. But professionals may be make better when a "manitou" replaces "rockshox".
Tight tolerances do make these a bit expensive to make however not as expensive as the manufacturers like selling them for. There are definitely high margins on these components.
Damn, wish I had compression adjustment on the damper side. My fork came with pneumatic travel adjust, which is just insane, didn't know what it came with, it was just a good deal online. I asked about replacing the damper with a R2C2, but apparently I can't. Yeah, the pneumatic travel adjust is just nutters, but the fork was half the price. I would love to work designing bicycle suspension, I feel there's tons of great ideas you could implement.
Can you make a video on Cannondale DL50 Headshok by any chance? such as 'How it's constructed, how the shock works and how to service it on a regular basis' and etc. Thanks!
Hi, thank you for this well done and very informative video. I'm struggling with a strange problem with my hydraulic (manitou) fork. Lock out function suddenly stopped working, I disassembled it and I found that the plunger have some existing-through-holes in it (that cant be closed by the handle bar command), besides the locking valve that should do the trick. I don't understand how it could ever lock the fork while some holes are always open. Any clue about the principle of whole thing? Thanx
Try using a script for your videos. In that way, what you wanna say is prepared in advance, reviewed, corrected and in the actual video is only the important stuff. As a result you have a straight well structured video, which does not confuse the audience. This is just an advice. Cheers! :)
Excellent props!! Poor prep. I'd like to cast a 2nd vote for @Dimitri... script suggestion. You don't have to actually read from the script, but at least plan out what you want to say. There was 5 minutes of incredibly helpful info in this video, but it was hard to sit thru the 8 minutes of stumbling around and trying to decide what to say while the camera was rolling. I appreciate the video. Thank you for making it.
What mechanism allows the rebound to compress easily/oil to flow through easily going one direction, but then hard for the oil to flow through going the other direction?
It looks like the video in comment. But, it's easier in rebound rod of that fork. There is a shim with spring, when it's going rebound, it is closed and minimum flow is used. As the rebound rod is getting into compression move, that kind of valve opens, max flow is used, rebound rod won't affect the compression move, as another part of fork is for compression use
great explanation tools using a clear damper tube, but holding it so that air mixes with the fluid while you're demostrating it is wrong and confusing. It ideally should not aerate and you are forcing the air through the valve with the oil giving an incorrect picture of whats happening. People will google this and get told that mixing oil and air is really bad in a damper and avoid RST and other dampers that operate like this (New Marzocchi Bomber B2 Rail damper) from this demonstration.
He has the damper upside down in the demonstration and explanation. The rebound knob should be at the bottom of the fork, and the black compression knob should be at the top.
That damper oil would not bubble like that your pretty much boiling it justbhop you have air pressure valves your gonna need em lol thats upside-down thin lower shaft goies downwards into the lowers blue end to bottom would normally be red but will be blue on this demonstration damper
Wow, what a wonderful explanation. What is the difference between a really expensive shock vs an inexpensive one ($900 Rock Shox vs an AliExpress $150 one). Does the rider need to be on the extreme end of the riding spectrum to notice (and care about) the difference. By way of example, I play a lot of tennis. I change strings once every 2 to 3 months. Roger Federer changes every 7 games. Very casual players buy a racquet and NEVER change the strings. Each class of player is happy and doesn’t notice any difference. How about forks? Can I buy an inexpensive fork, ride frequently, and never notice a difficiency because I am riding mostly xc stuff and never getting close to the limits???
@@robertwasden2691 My original post was 1 yr ago. And you nailed it. 6 months ago I upgraded to a nice rockshox front and rear suspension - transformed the bike. I do have Chinese CF wheels on several bikes and so far no issues at all. I am not a bike park guy and most of my riding is XC and trail riding. They are light and seem well suited for my application.
@@jeromep4148 glad to hear it Jerome...it's all about fun and as long as you are enjoying it that's all that matters! It's great to have some trick bits on your bike but making savings on parts is all good where you can and where it's appropriate. Hopefully many more miles and many more smiles out on the trails!
Nice explanation. Few thoughts: 10:07 you said, that for moving from one postion to other you need same force. That's not true, you probably meant same force difference. The linear behaviour of coil can be described as F= k*x , where F is force in newtons, k is stiffnes of the coil in Newton/meters and x is a travelled distance in meters. Whereas force needed for compressing air spring is derived from gas law (for this purpose let's assume ideal behaviour and adiabatic compression - really fast compression): F = p*S*[L/(L-x)]ᵏᵃᵖᵖᵃ, where F is force in newtons, p is initial pressure in air chamber in pascals, S is area of a piston in air chamber in squared meters, L is a travel of a fork, x is a travelled distance in meters and kappa (in exponent) is a heat capacity ratio - for air it equals 1.4. The progressivity of air springs is a result of power dependence. Theoretically, if you use different gas (such as CO₂) you can change the characteristics of the fork (it would be more shallow, linear-like).
a local dude has the RST F1RST Air 29"fork( I think), but the compression does can't be adjusted, does nothing, also rebound is not working, air pressure at at proper pressure I guess for the rider, I lowered it for him, cus it was not possible to get it to go down with all of my body weight was closer to 100psi, but at 70 psi, which made it move more, but it still was very harsh seems like the compression is too hard and that's the only setting no matter which I put it in, rebound damping is at max no matter where it is. I have no experience with this fork, but that's a topic I haven't seen anything about, failed compression and rebound units. he got the bike second hand, so there is no telling how much and which kind of abuse the fork got, or if it's just bad internals, or neglect, but this would be an interesting topic to explore further.
There's probably no oil in the damping unit at all, that's why compression and rebound doesn't work. From what I read I think this fork needs maintnance desperately.
I'm not an engineer, but I think coil springs have much more progressive work than air. That's why we use tokens, to give more progression on last cantimeters.
Hook's Law for an ideal mechanical spring is F = k * x where F is the spring force, k the spring constant, and x the distance traveled. So, that is a linear relationship between the force of the spring suspension and the travel. I'm an engineer, though not mechanical, but I believe most all traditional manufactured springs operate pretty darn closely to Hook's Law, though there might be some non-linearity when very near bottoming-out. Obviously, there is a big non-linearity when the spring does indeed bottom out, where the force F goes up very high, ouch haha. Using an air chamber as a spring, though, is naturally progressive in the spring force. As the fork compresses, the chamber gets smaller and by Boyle's Law the pressure in the chamber becomes higher. That increased pressure as the fork compresses will require more and more force to get the fork to travel farther, hence progression. The tokens just help increase that natural progression to give a better feel on the terrain or just for more insurance from bottoming out.
@@ryanotte6737 it took me 9 months to understand how stupid was my assumption. Thank you! With your help now, can we point out some misconceptions at 9:55? Correct me if i'm wrong, but It doesn't use "pretty much the same" force to compress spring at its 10to20mm (rough 10 to 20% on that 100mm fork) travel, than on its 70to80mm (70-80%). It needs about 4 times more force in second case.
@@AntiDEDok What he is getting at there is that the coil spring has a linear force relationship to the travel distance. He might say that there is the same force ADDED to each increment of travel to be more clear. We can compress the spring from 10mm to 20mm to 30mm, and so on and we keep adding the same amount of force needed to push that far, like maybe 50N to 100N to 150N as an example. In that case, the spring constant is k = 5 Newton per mm.
Best explanation on how shocks work. Seeing the insides at work made all the difference. Good one🤟
Apart from the damper being upside down like everyone else pointed out, it's worth mentioning that the bottomless tokens are installed ABOVE the upper seal, not below. Like in the damper stanchion, the chamber above is connected to the main spring chamber by channels. That's why the tokens are only limiting the air volume without changing the actual travel of the fork.
Best explanation I have seen so far on the fork mechanics and dynamics. Thanks!
You had your damper cylinder upside down. The compression adjustment is on the top. That is why that giant air bubble was mixing with the oil. That actually hurts damping performance. If the cylinder was the right way up, the air would have been above the compression piston, and the air would not mix with the oil.
Yea! Because it causes cavitation when that happens.
The way he held it you mean?
Or you are talking about sth in its structure?
@@pishi_man He held it upside down. The rod that slides in and out should have been at the bottom.
Yeah look at 12.08 aswell whare he's saying the volume tokens go! Half way down under the seal 😂 geez this video's most confusing ever needs to be remade
hey, i'm brazilian and i really aprecciate this video, bcz here in youtube brazil, there isn't videos explaining how this type of suspensions works. Thank you boy, success to you!
I watched dozens of fork maintenance videos before taking mine apart, none of them mentioned that there is a type that has only springs in both sides.
Really good explanation. It has been difficult for me to find that kind of video. And really clear even for a spanish talker like me. Now I can clearly understand how does the fork work.
Excellent video 👍👌👏!! Thank you!
Im returning to serious MTBing after 20 years away...
hahaha the last suspension I saw the inside of was the 1998 base model Rock Shocks (was it a Judy? ...me thinks yes!)
They were toys back then...plastic air springs both sides...this is completely different. This is easily as sophisticated as the Ohlins motocross suspension I used to use on my dirtbikes.
Now I understand the cost, and see the value...even if other companies have different methods to achieve the same things those things are really being addressed (Hi/Low speed compression and rebound dampening) My hope was to see this level of sophistication and I am not disappointed. thanks again
Grrrreat tutorial! Finally someone who took the job really seriously and got us, forknerds from oblivious bumping over trees to scientifically supported cruising through the woods :D Love the dummies!
Best explanation of suspension forks ever. On my shopping list.
Thank you very much I finally understood how forks and its functions work! 😁
Thank you for your explanation. It's so easy to understand!! Super helpful
love your channel man, always giving a deeper understanding of the mechanics behind our ride.
Pretty straight forward analogy for explaining bike suspension from rider's perspective and good job for the demonstration of suspension parts!
However, there are some points need corrections or better explanation to not misleading non-suspension enthusiast viewers.
6:16 That is the upper part where the compression or lock-out knob located (at your hand reach when you ride).
10:29 I think you wanted to refer to the dimple on the wall of air-spring cylinder tube which has main job is to balance the pressure between positive and negative chamber. Some forks will need a bit of cycling the fork to equalise the pressure, but some new forks nowadays may not need to. Some claim that having dimple at zero travel can affect small bump sensitivity...
11:03 The polymer spacer (Topout bumper) in the negative spring chamber is supposed to work as cushion when fork fully extended. (I'm not sure if this scenario is called 'off the top'?...please correct me if I'm wrong) For bottom-out cushioning, some forks has polymer spacer in lower leg to take the hit from stanchion, some cheap coil spring forks has polymer rod in the positive spring chamber to do that task.
Also makes a good case for the latest damper designs from Fox and Rock Shox using bladders or sealed chambers separating the oil from the air and preventing the foaming or "cavitation" which may lead to unpredictable dampening characteristics.
Thanks man! English is not my first language but I still understood everything.
being an engineer, i always think how we take things for granted never thought how it actually works , good job #SickBiker
yo u totally nailed it...been looking for clarity on compression dampening for ages ...thanx
This video makes me want to take apart my SiD and clean everything.
your explanation answers all my questions, thank
I’m an Indian boy. I liked your video too much. You did a great explanation about this topic. I truly liked your video. It’s very helpful to me
Great video and lighting quality, audio quality, and English 👍 overall very helpful and professional
Thank you for this lesson i don't really know whats inside or the operation of Lock out fork even to adjust..now i know !😁💪 thanks!
This was so amazing for me to watch and learn from!
I had no idea that each of the front forks do different things! Engineering is so awesome!
I live in india, i am 44 years old, im new to current MTB tech although ive been oggling all these youtube videos for years now.
I used to cycle more than i walked during my schooling days. My bicycle was called the StreetCat RockNRoll ❤😂 The coolest bike available in the 90s in india 😅 Cool dad i have!
I still havent ridden a 27.5. I stopped a stranger and rode his 29er recently, felt like i was riding a horse, so awkward!! 😂
I'm traveling to thailand and excitedly waiting to ride a cycle trail and hopefully pick up a frame and suspension and cranks to build a cycle cheaper than they sell in india.
I ride agressive street, like climbing down stairs and wheelieing and well not stoppies anymore cuz im freakin 80kgs now (still very fit though).
I guess my reason for rambling is im hoping to find hints and suggestions for minimum requirements for my dream cycle build.
Okay, sorry for rambling! Thank u for this excellent video!
Very clear explanation! Very interesting
Hey hey! Greate video! But unfortunatly you've got a mistake! You should turn up side down reboutdamper. It could be shown correct work of it.
Learned so much!
Much easier to understand when you can see what's going on in your fork. Thank you for making the video and explaining🙏
Thanks Dude, Now I understand. Made adjustments. Will do again on the trail.
Amazing explanation. Just what I wanted to see. Thanks!
This explanation answered my question why all fork's down-tube always connected
Nice video, thanks 👍 I've just bought a new bike with front suspension and wonder how it works 🤔 Thanks for explanation 👌
Great video and explanations. What I still don't understand is how the lockout works and I can't find anything on the net.
It works in the same way as the compression adjustment. It just completely closes off the valve that allows the oil through to the other chamber, rather than having it still open slightly, thus no compression at all so the fork wont move. There was a video that had Jordi Cortes from Fox explaining how it works, but i cant seem to find it.
@@lawlerskeetz Thanks man :)
It closes the oil flow, as shown in the video.
Just blown away, best suspension explanation I've ever seen
Super helpful and really interesting, thanks for putting this out there!
As some folks has said, you explain the rebound side upside down, the compresion knob is the upper one, and the rebound knob is lower one, near the drops
Great video ! i watched 25 videos and just didnt click. I watched yours ....Boom ! it all made sense! lol. thank you
great :D
will you make a Manitou video?
Great video, very nice explanation
However you kind of messed up the damping side of the fork...what i mean is that you explained it upside down...rebound is on the downside and compression on the upside (lookout is always on the top, rebound adjuster on the bottom)
You can also see it at the rod sticking out of the damping unit...it connects with the lowers via a screw, whereas the other side is screwed into the forks crown.
So everything is alright, expect you have the damping side turned upside down in your explanation and in the background : )
Please don't let this be true...in every other discipline his explination is correct, why would it be different for mountain bikes? Think of the physics, when the forks compress it's called... Compression.
To lessen said compression or to dampen it would be the compression dampening adjustment no? then when the fork is kicking back against the compression is called the rebound and to lessen that effect is the rebound dampening (er)?
@@matt-g-recovers yeah nothing wrong with his explanation, he just held it upside down. In assembled fork it would be turned around, so that the compression adjuster is on the top and the red damping adjuster at the bottom of the fork. Otherwise everything is correct and perfectly explained :)
Very good video. I'm wondering how forks and shocks can have different rebound and compression adjustments for high and low speed.
what the fork
Greetings from the UK, and thank you for this superb explanation.
Springs that are made with a uniform thickness rod will have a linear characteristic. This tweaked to give a spring a progression characteristic changing the pitch of the coil wind and by heat treatment. The true progressive spring will be made by using a tapered rod, one where the rod is slightly thicker over the length of the rod coiled to make the spring too changing the pitch of the spring coil to a smaller pitch at the end where the ticker material is coiled will vary the spring compression progression depending where the pitch changes. If the pitch starts halfway through the spring and the pitch progressively decreases over the remaining length. The the spring will have a linear characteristic for the first half of the compression but will require greater force the more it is compresses beyond the halfway point.
I think you had the rebound upside down
Good day! Is that demo cartridges? They are transparent and thats looks cool!
Dang. A very good explanation
Great video, but it does not mention an important part - explaining how negative and positive chambers work and what are they used for :)
It's a very interesting topic, and I guess DualAir shocks are really great, allow you more adjustments and less sag
Hello there. Great video! Thank you for taking the time to make it. Where did you get the props?
The best explanation i0ve found. Thanx :D I guess the rear suspension's are the same... Air & coil.
it would be great to have thos models with transparent cases to view the inside of the forks and the rear shocks :D
What is more advanced / prone to breaking? Hydro or mech lockout?
what the fork!
I wonder why there are not many "upside down"-style forks for bicycles yet as those have been the standard on motorcycles for decades?
Me too
They are much more expensive to be made
Thank you so much for the lesson
You're genius🖤
Nice explanation but I wonder how Cannondale Lefty works?
The two parts are above each other.
12.09 the volume tokens don't go in that chamber nothing changed there they sit in the top chamber
Please also make a video on the working of hydraulic disc brakes
Excellent Explanation Bro
Brilliant explanation. Worth the time.
Right, I have a question. Why these two tubes and two pistons cost $1200 sometimes? I see no room for expensive manual manufacturing. Each piece is made automatically, and an assembling does not require a sophisticated routine.
tighter tolerances, better materials, more adjustment... and your paying for the name
@@hermanngerman5805 Exactly this is similar to a price difference between 64GB and 128GB. I'm far from thinking that a bike is an iPhone ) For me it's ok to take a China carbon, place a "Canyon" sticker and use it until it dies. No problem. But professionals may be make better when a "manitou" replaces "rockshox".
Tight tolerances do make these a bit expensive to make however not as expensive as the manufacturers like selling them for. There are definitely high margins on these components.
Can you make video on how to disassemble and rebuild step by step on manitou markhor fork.
Das beste Erklär- Video zum Thema Gabel i've ever seen!!! 😅🤘🏻👍🏻👌🏻💪🏻
Damn, wish I had compression adjustment on the damper side. My fork came with pneumatic travel adjust, which is just insane, didn't know what it came with, it was just a good deal online. I asked about replacing the damper with a R2C2, but apparently I can't. Yeah, the pneumatic travel adjust is just nutters, but the fork was half the price. I would love to work designing bicycle suspension, I feel there's tons of great ideas you could implement.
10:28 Formula dh fork has 3 air chambers, MRP ribbon and other forks they got has two chambersalso formula enduro fork has 2 chambers.
Can you make a video on Cannondale DL50 Headshok by any chance? such as 'How it's constructed, how the shock works and how to service it on a regular basis' and etc. Thanks!
Nice explanation how suspension works
great video! very informative, do you have a video about repairing hydraulic lockouts?
Great video. No one seems to cover suspension oil weight, tho.
Great video, perfect explanation! Thank you !
Hi, thank you for this well done and very informative video. I'm struggling with a strange problem with my hydraulic (manitou) fork. Lock out function suddenly stopped working, I disassembled it and I found that the plunger have some existing-through-holes in it (that cant be closed by the handle bar command), besides the locking valve that should do the trick. I don't understand how it could ever lock the fork while some holes are always open. Any clue about the principle of whole thing? Thanx
Try using a script for your videos. In that way, what you wanna say is prepared in advance, reviewed, corrected and in the actual video is only the important stuff. As a result you have a straight well structured video, which does not confuse the audience. This is just an advice. Cheers! :)
SickBiker dude does a great job of explaining without scripts... who cares that it isn't presented like some infomercial
Excellent props!!
Poor prep.
I'd like to cast a 2nd vote for @Dimitri... script suggestion. You don't have to actually read from the script, but at least plan out what you want to say. There was 5 minutes of incredibly helpful info in this video, but it was hard to sit thru the 8 minutes of stumbling around and trying to decide what to say while the camera was rolling.
I appreciate the video. Thank you for making it.
Great video! Clear explanation!
Very well explained - thank you!
Thank you so much, great video, simply explained and i understood everything! Great job you got a new subscriber! :)
Awesome video! But i have a question, how does the Cannondale 1 fork bike works ? 😆
This is a good video, many thanks
What mechanism allows the rebound to compress easily/oil to flow through easily going one direction, but then hard for the oil to flow through going the other direction?
th-cam.com/video/iFlPta8vaIk/w-d-xo.html This can be a help.
It looks like the video in comment. But, it's easier in rebound rod of that fork. There is a shim with spring, when it's going rebound, it is closed and minimum flow is used. As the rebound rod is getting into compression move, that kind of valve opens, max flow is used, rebound rod won't affect the compression move, as another part of fork is for compression use
@8:40 I think you were trying to say not to bottom out
Gracias por tu clara explicación! Necesitaba entender como funciona para poder reparar.
Great, i learned something from you sir. Thank you so much.
These damper models should be named; Kavitation King!!! hahahaah!
😂
Your videos is informative sir.. gives me a lot of info..
Nicely done!
Excellent content. Thanks m8 !
great explanation tools using a clear damper tube, but holding it so that air mixes with the fluid while you're demostrating it is wrong and confusing. It ideally should not aerate and you are forcing the air through the valve with the oil giving an incorrect picture of whats happening. People will google this and get told that mixing oil and air is really bad in a damper and avoid RST and other dampers that operate like this (New Marzocchi Bomber B2 Rail damper) from this demonstration.
He has the damper upside down in the demonstration and explanation. The rebound knob should be at the bottom of the fork, and the black compression knob should be at the top.
Good explanation
And good english lesson for me
thank you❤
Very nice. Well explained. Thank you Sir.
So kind explanation!! Many thanks!!
That damper oil would not bubble like that your pretty much boiling it justbhop you have air pressure valves your gonna need em lol thats upside-down thin lower shaft goies downwards into the lowers blue end to bottom would normally be red but will be blue on this demonstration damper
Great explanation!
I think that you hold the oil rebound part upside down.
Wow, what a wonderful explanation. What is the difference between a really expensive shock vs an inexpensive one ($900 Rock Shox vs an AliExpress $150 one). Does the rider need to be on the extreme end of the riding spectrum to notice (and care about) the difference.
By way of example, I play a lot of tennis. I change strings once every 2 to 3 months. Roger Federer changes every 7 games. Very casual players buy a racquet and NEVER change the strings. Each class of player is happy and doesn’t notice any difference. How about forks? Can I buy an inexpensive fork, ride frequently, and never notice a difficiency because I am riding mostly xc stuff and never getting close to the limits???
buy cheap buy twice 😁if you'd rather not risk your cheapo fork breaking and headbutting your handlebars, spend a bit more and get a decent one
@@robertwasden2691 My original post was 1 yr ago. And you nailed it. 6 months ago I upgraded to a nice rockshox front and rear suspension - transformed the bike. I do have Chinese CF wheels on several bikes and so far no issues at all. I am not a bike park guy and most of my riding is XC and trail riding. They are light and seem well suited for my application.
@@jeromep4148 glad to hear it Jerome...it's all about fun and as long as you are enjoying it that's all that matters! It's great to have some trick bits on your bike but making savings on parts is all good where you can and where it's appropriate. Hopefully many more miles and many more smiles out on the trails!
Nice explanation.
Few thoughts: 10:07 you said, that for moving from one postion to other you need same force. That's not true, you probably meant same force difference.
The linear behaviour of coil can be described as F= k*x , where F is force in newtons, k is stiffnes of the coil in Newton/meters and x is a travelled distance in meters.
Whereas force needed for compressing air spring is derived from gas law (for this purpose let's assume ideal behaviour and adiabatic compression - really fast compression):
F = p*S*[L/(L-x)]ᵏᵃᵖᵖᵃ, where F is force in newtons, p is initial pressure in air chamber in pascals, S is area of a piston in air chamber in squared meters, L is a travel of a fork, x is a travelled distance in meters and kappa (in exponent) is a heat capacity ratio - for air it equals 1.4. The progressivity of air springs is a result of power dependence. Theoretically, if you use different gas (such as CO₂) you can change the characteristics of the fork (it would be more shallow, linear-like).
it's like you tell someone that you don't consume energy...
I think you have a mistake, the damper side is with thicker part up isn,t it?
That is really useful for riders, thanks
Thank you! Easy to understand, I get it now!
Great explanation, thanks dude.
Thanks man! Very clearly described.
a local dude has the RST F1RST Air 29"fork( I think), but the compression does can't be adjusted, does nothing, also rebound is not working, air pressure at at proper pressure I guess for the rider, I lowered it for him, cus it was not possible to get it to go down with all of my body weight was closer to 100psi, but at 70 psi, which made it move more, but it still was very harsh seems like the compression is too hard and that's the only setting no matter which I put it in, rebound damping is at max no matter where it is.
I have no experience with this fork, but that's a topic I haven't seen anything about, failed compression and rebound units. he got the bike second hand, so there is no telling how much and which kind of abuse the fork got, or if it's just bad internals, or neglect, but this would be an interesting topic to explore further.
There's probably no oil in the damping unit at all, that's why compression and rebound doesn't work. From what I read I think this fork needs maintnance desperately.
I'm not an engineer, but I think coil springs have much more progressive work than air. That's why we use tokens, to give more progression on last cantimeters.
Hook's Law for an ideal mechanical spring is F = k * x where F is the spring force, k the spring constant, and x the distance traveled. So, that is a linear relationship between the force of the spring suspension and the travel. I'm an engineer, though not mechanical, but I believe most all traditional manufactured springs operate pretty darn closely to Hook's Law, though there might be some non-linearity when very near bottoming-out. Obviously, there is a big non-linearity when the spring does indeed bottom out, where the force F goes up very high, ouch haha.
Using an air chamber as a spring, though, is naturally progressive in the spring force. As the fork compresses, the chamber gets smaller and by Boyle's Law the pressure in the chamber becomes higher. That increased pressure as the fork compresses will require more and more force to get the fork to travel farther, hence progression. The tokens just help increase that natural progression to give a better feel on the terrain or just for more insurance from bottoming out.
@@ryanotte6737 it took me 9 months to understand how stupid was my assumption. Thank you!
With your help now, can we point out some misconceptions at 9:55? Correct me if i'm wrong, but It doesn't use "pretty much the same" force to compress spring at its 10to20mm (rough 10 to 20% on that 100mm fork) travel, than on its 70to80mm (70-80%). It needs about 4 times more force in second case.
@@AntiDEDok What he is getting at there is that the coil spring has a linear force relationship to the travel distance. He might say that there is the same force ADDED to each increment of travel to be more clear. We can compress the spring from 10mm to 20mm to 30mm, and so on and we keep adding the same amount of force needed to push that far, like maybe 50N to 100N to 150N as an example. In that case, the spring constant is k = 5 Newton per mm.
Now rear shock video