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Crazy MTB Hacks & Resourceful Bodges | GMBN's January Hacks & Bodges
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- เผยแพร่เมื่อ 15 ส.ค. 2024
- Welcome back to another month's Hacks and Bodges Special! This is the show where we look at all your MTB hacks and bodges you’ve sent us through the upload service. If you have a cool mountain bike hack that you’d like to share with us or a bike bodge that got you home after your ride went astray, send it in and you might be featured. Now, on with the hacks!
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Which was your favourite this month? Let us know in the comments!
Definitely the Lego head
Yeah ofcourse
The Lego guys valve cap idea is golden.
the bike rim lamp is my favorite
My favourite was Martyns realization to his "double-use" innertube hack/bodge 😂 awesome video as always guys!💯👍😎
Oil contracts when cooled down, meaning that in cold conditions there is smaller volume of oil in the system and the hydraulic system cannot put enough pressure on the remote - hence the slow function. If you bleed it with chilled oil, you make sure there is enough oil in the system in cold conditions.
Thanks for the explanation Michal, that's kinda what I thought. Top man.
Right, but wouldn't it mean that it will put enough pressure in the dropper to activate or maybe even break it once it gets warmer?
thank you!!
@@Flaffi78 I’m not an engineer so don’t dare to make a precise judgement. It will definitely overfill the system, but I’m not sure how badly. Another bleed in spring might not be a bad idea.
@@martynashton3607 my pleasure :-)
Neil...calls 1/2 a bike wheel made into a lamp a bodge, has a 1/4 tire as decoration on the set.
Nah that's Blakes
Swapped out the summer air in my tyres for some winter air ....you can get the same results by getting some air out of the freezer if it’s not quit cold enough!!!!
😂
I always go for spring air , extra bounce for your buck :0
jason milsom warm the winter air in the microwave for 30 seconds for spring and 45 seconds if you want summer
That shock mounting bracket looks casted, doesnt it?
I think it is casted and really nicely done!
Yeah deffo looks that way
Reverb does freeze and if you lower saddle you can't extend ..a
until warm.up.....solution... swap out hydraulic for Wolf tooth cable dropper..then never an issue on the reverb again!
By all rights, Doddy should be hosting this because he'd understand what he's looking at. But watching these two try to work out how somebody 'carved' aluminum or whether oil expands or contracts when it gets colder is much more entertaining.
Seriously, though, I love you guys. Thanks. :)
The oil's viscosity will change, but expand/contract? I don't think so. I'm really intrigued as to why that cold-bleed would work
@@heymadam Yeah same, I noticed my fork becomes really stiff during cold temp, or if I leave my bike outside too long. Wondering if I could setup my fork for winter???
All matter on earth contracts as it gets colder. Only exception water, it expands at freezing point
@@derrickhenninger3727 the weird part is water only has a tiny part of its temperature where it expands and density goes down, for the most part it behaves like everything else. But that little exception is why freezing doesn't start at the bottom of a pond or lake and instead ice is at the top and water remains liquid below. I've heard it said that this tiny exception with water is one of the reasons life exists in the first place.
I think you pressurize the dropper in the summer at 25C. Then, when you ride at 0C the air in the dropper contracts. This reduces the pressure to the point where the dropper does not work well. The oil and dirt could get sticky in the cold too. Put a little more air in the dropper .
Rockshox Reverb has a hydraulic activated Valve and as the fluid contracts in the cold the Valve isn't pushed in far enough to extend the dropperpost at the normal speed but if you bleed it with cold (contracted) fluid it operates as usual in the cold and even faster if it gets warm again
Its oil, any contraction in the cold would be negligible.
Its just cos he did a bleed.
In fact, the cold if anything, would cause the metal fluid channels to contract, so doing the bleed with the post and remote cold, might allow marginally more fluid in...but its minute.
@@rupedog No, Hawcon is correct. The oil does contract in the cold, and it also expands when the brakes get hot. There is also a small amount of air and water that gets into the oil and contaminates it. A brake bleed doesn't necessarily get rid of all of those contaminants so there's a certain margin of error there but its small. Air and water also get in through the seals especially near the pistons. Some SRAM brakes even have air reservoirs for air bubbles to be caught in, this is what they teach to their mechanics. Shimano brakes are even more susceptible to it because they use mineral oil vs dot 5.
Source:Work as a bike mechanic in MN, lots of fat bikes means lots of cold brakes
#GMBN #GMBNTech So thus bleeding with cold oil introduces a higher volume of oil than is achievable and room temp or higher. I would worry about damaging the post with higher oil volume when it warms up.
@@bugboy152000 I don't think the oil would expand enough to bottom out the Valve and cause problems
GMBN, thank you all. Keeping the vids coming during this terrible pandemic. I love that all of you have stepped up and provided us with what we love so much, MTB’ing. Love you guys and love what you stand for and all the hardwork!!! Cheer guys and send it!!!!
Martyn should never wear a hat and cover up that gorgeous head of hair. I wouldn’t... haha. Thanks guys!
Neil the party pooper... You better sing next time or else, I will never ride a bike again.
My favourite item from this months Hacks & Bodges is the lamp stand, cos it’s just so cool 😎.
That 3d printed alloy pivot/shock mount is hack of the week. All of the minute measurements and the painstakingly detailed 3d designing required, not to mention that the process typically takes a few attempts and minute design alterations before you have a working product. That took the most work and yielded the most reward compared to the other submissions. I like Martyn’s singing, by the way. Neil, just let it go...man! Just once, take a deep breath and join in on the song. You will feel such a weight lifted from your chest if you do. Just once, belt it out loud as you can!
The dropper is slow firstly because the air or gas that provides the lift will have contracted , as gasses expand in heat and contact in cold and you can add stiff seals to that. As for freezing the oil it makes no sense, oils have an upper and lower temperature rating. One thing to help hydraulic systems in the cold is to use thinner oil.
All in on the Legos valve covers. Going to put them all my bikes right now
I was so worried that you were going to say the guy from the first hack "fixed" his rattly cables by spraying expanding foam in there! Edit: my god, Martyn. Same idea!
I said this too out loud (in jest, I hasten to add). 😂
Hi Neil!
Water hast the smallest volume at 4°C. On lower "and" higher temperatures it expands.
Cheers!
That's one of the crazy reasons why life even works on the planet. Maximum density at 4C or like 39F so freezing starts on the top of a pond instead of the bottom. One of the few exceptions to a frozen material not being more dense than liquid.
Martyn adds the comedy to the show and blake adds the spice. With Neil we get a lot more explaining and straight forward
Neil gmbn's only bike snob ;)
My feeling exactly. Any person with a little bit of skill and a welder can build a bike stand.
@@posbus12657 I've thought it for awhile others just won't say it lol 🤷♂️
That light is cooool. No way is that fitting the definition of a bodge...
Th shock 9:20. cold oils contract. If you set the shock up with warm oil. Afterwards when you are out in the cold the oil will get cold an contract and a air pocket will form. And then you have to blead the shock. So if you set it up with cold oil from the beginning it will not contract and no air pockets will form
Damn... I thought I was miserable. Neil takes it to the next the level.
That suspension part hack is definitely the most engineering intensive one if we look at it from designing and manufacturing aspects. It may look rough finish, but functions as intended.
About the dropper post not return as fast as it should, my different theory would be the reduce in air pressure inside the air chamber in the dropper due mianly to PV=nRT relationship. As temperature reduced, pressure will also reduce as well (P1/T1 = P2/T2, assuming same number of mole of the gas (air) and volume). Hence, the force exerts on the piston (that takes up our weight) is decreased and with increased viscosity of hydraulic fluid combined, this results in slow return dropoer post. (assuming static friction from seals and moving part are the same, therefore dropper post acceleration is reduced).
9:05 newtonian fluids expand while freezing, and they reduce their volume when heated up to melting point. #Neil #fluid #MArtyn
Your statement is true but these specified oils have oil-polymer additives like polyisobutylene etc that gives them non-newtonian charasteristics. According to Bernoulli's we find that mathematically it makes difference if we bled cold but i do not think if the effect was significant in such a small volume inside a brakeset.
The oil doesn't freeze at -18°c, so it'll contract. I guess the issue is the fixed volume of oil in the hydraulic system shrinks when cold so the lever won't work, so start with the oil at operating temp/volume and it works in the cold. When it warms up in the garage at night the seat shoots up randomly? - probably around 2-3 am I expect...
Haha funny to see Neil sap Martin’s enthusiasm. You can see it on Martin’s face a couple of times at least.
When water freezes, it expands. This is why so many pot holes arrive after the winter months; water drains into the cavities within the surface and when frozen the expansion forces out the components beneath the surface - generally the inlaid granite chips within the tarmac, which is the mess you see around a pot hole. NO, I'm not a Roadie just a petrol-head and engineer :)
Maybe you're not following the theme, that even tho a hack or bodge may be good or rubbish, these have people thinking and going at it as they can. Yes, his shock bracket is a bit rough, but it was a good few days of mind work to a 100% fix. Applauded. Celebrate the try. Neil, get a pint on before going on air. You're to up tight.
Evening from the not so sunny Greece!!!! Thats a nice design there but if you want to take it up o notch you can put some rubber or other elastic material to the clamp that holds the bike to avoid damaging the frame with scratches. Cheers.
2:17 *Congratulations! You've just made your bike have a pair of balls*
The second hack - Bikeyoke makes a yoke to replace the Specialized stock yokes.
When I was at the RockShox service shop in Squamish to get my Reverb serviced, after they stored it in a fridge prior to giving it to me. I always wondered why and if this guy was onto something. My reverb was in because it was not running fast in the cold.
By bleeding a dropper post with cold oil, you are setting it up to work in the cold. Water is the only liquid that actually expands when frozen/freezing, however, the reverb oil does not freeze, or expand, it just gets very cold begins to contract under these temperatures. All bike shops will service dropper posts at room temperature, so when the fluid gets cold in the winter, it’ll contract and the dropper will not work as well due to negative pressure in the dropper post. If you service it while the reverb oil is very cold it will not be able to contract any further when riding in the cold, therefore solving the issue of cold oil causing a dropper not to work.
Rattly cable hack is the best.
Going with the homemade Link, as it seems the most difficult, but lego heads the easiest and most fun!
Viscosity of the oil would be different at different temperatures but I can't image that it makes a difference if the system is completely purged of air it should be OK whether it's hot or cold.
the lego was sick!!!!!!!!!!
@Craig. Your lego head on the valve is brilliant!!! My son loves this - he's doing one now, 😂
On the foam issue. If you ran a long cable through both of the housings and taped them together, you could probably pull the new housing through the foam without too much trouble.
So this is just my opinion on the Rockshox reverb. I have a lot of experience with hydraulic systems. The first thing to understand in hydraulics and how they work is a liquid cannot be compressed meaning unless you have a leak there will always be the same volume of liquid in the system. Water freezes oil does not. When oil gets cold the viscosity changes and becomes more viscous (thicker). I would hazard to guess that there was air in the system and should not matter at what temperature you bleed it at. However the more you use the dropper in the cold the oil will heat up slightly due to friction in the system changing the viscosity (thinner oil) and improve the performance of the system.
my guess for the dropper post is the fact he did a bleed was the main reason. if there's air there's moisture that freezes and expands possibly restricting flow or sticking components.
I only rule out the oil as I believe the oil is a straight weight oil meaning the viscosity shouldn't change under temperature conditions. But if the new oil has a lighter weight it will flow better in cold conditions.
Will Neil ever singalong ? The workstand was my fav. Lovin' the show guys .
Definitely the bike stand. Most useful thing there for sure.
Neil go and see your local tech college and see if they run any beginners welding course, it is how I learnt the basics then when on to do other course they offered to become a proficient welder that I am now I have my own mig, tig, oxy acetylene and plasma cutter not to mention my old faithful copper coil manual arc welder which was the first welder I bought
When I get a new bike (stolen) I am going to use lego heads, I have tons of em. And the best was the home made linkage (and it looks amazing for something homemade) and the homemade bike stand.
Hydraulic fluid contracts in the cold. This means when the lever is pushed the fluid doesn't move as far or as fast. Bleeding it when cold will mean when you fill up the hydraulic fluid it will be full at cold temperatures. Therefore when you push it in the cold the chambers and cables will be as full as usual and everything will operate as it would if set up and used at warmer temperatures.
It doesn't contract...its viscosity increases
Lego heads 😀 genius! Did it say if its perfect diameter for presta or has he had to tuck some blu~tak in there?
blu~tak = bodge
Perfect diameter = hack
I'd say they'd be spot on the right size if anything a tight fit so maybe needed stretching a bit first fit. Actually if you look at the 1 with the white helmet xwing pilot or whatever Martin said it was then you can actually see some tiny white dust at bottom of valve that might be from the first time screwing it on as it slightly cuts the thread in to the plastic head.
I'm definitely going to test it over the weekend!
Ive spoke to my mate with more kids than sense, he said he'll dig some out for me 👍
Water responds the opposite way to most liquids with temperature. It's one of the convenient mysteries of life on earth...it expands when it's cold. Other liquids, such as mineral oil, retract when cold and becomes more dense. Setting the dropper up properly with freezing oil sets the pressure up to work when it is freezing cold. It probably comes up more quickly under normal conditions, but works when it's at that base temperature.
freezing oil, meaning below the freezing temperature of water. The freezing temperature of mineral oil is -35F.
Best example of Mountain Bike Technical Terminology I have heard so far:: "The Foam Wrappy Bits."
So what i think is that because fluids(accept of water) contract when they freeze or get cold he sets it up cold and so he actually has more fluid in there than he would if he set it up warm. So when it gets cold again it is the wright amount.
My LBS fixed the issue with the Reverb getting stuck in freezing temparatures with a rebleed with cooled oil and it worked. I think it has to do with the viscosity of oil being different depending on it's temperature.
Martin and Blake on the show are the the best team for hacks and bodges ;-)
Lego by a head !
I had the same problem with my reeverb post and a normal bleed at 15°C did just fine. What that guy did was probably in order to fit as much fluid as possible in the available cable volume so that when the temperature drops in the cold you still have enough fluid to open the poppet valve.
Disc brakes are a closed system.
At lower temps things contract, fluids too (only water expands upon freezing) this inside brakes effectively creates a negative atmosphere pressure and brakes can completely cease working as the internal pressure on braking may still be lower than atmospheric pressure and that is keeping the cylinders in that and the small air bubbles that are never 100% out unless you vacuum bleed can expand at the decreased inner pressure making it like you never bled the brakes in the first place.
I did not encounter that as I usually stop riding at -3C
Incorrect....u think u cant drive a car in winter cos the brakes dont work! No.
Hydraulic DOT fluid is very temp stable. And reverb fluid is not DOT fluid, but just low viscosity oil.
The cold with increase its viscosity, but it wont contract to any appreciable amount. Go freeze a bottle of it, and see.
@@rupedog Car brake fluid doesn't need to be bike brake fluid, mostly since you often DIY bleed it.
the oil inside the pipe contracts, therefore in effect making the 'cable stretch' in other terms. It creates an effect that the cable would only be pulling the release clip halfway, as there is physically less oil withing the pie so it can't push the actuation switch open on the dropp as far as it would if the oil was at normal temperature. Bleeding it while the oil is contracted in effect forces more oil into the pipe to start with, meaning that when the temps drop there will be the correct amount of oil withing the pipe
hope that helped
To the welder of the bike stand. Get making and selling them they look great and would definitely buy one
Water expand when gets solid. I really wouldn't know if it's works because I live in a warm weather. (Barranquilla, Colombia) but if it's a oil base fluid it will work because at lower temperatures oils increase the viscosity. And lowerd the density. So if you put it cold you will copy the external conditions. Sorry if I made any grammar mistakes english is not my first language.
Great show, bike stand for the win
Shock mount? He could easily sand that down and polish it before painting or powdercoat, or leave it raw. Hack because it fits to very specific measurements, but just needs some literal polish to look acceptable for the non-fabricators.
My first thought about the oil in freezer is to prevent it from attracting moisture as it's poured into the system, assuming his garage is freezing cold. That could slow down the valving and flow if there's FROST inside the lines. Otherwise, it's because mineral oil, like most other fluids, compress as they get cold so the system is 'low' once he's out in the freezing cold wild vs in the warm garage.
FYI, 24 °F or −4 °C for mineral oil. If he's riding in -5 °C it's slow because the mineral oil is actually freezing in the lines and he's got a false positive because using the cold oil only seemed to work in -3° C weather...
Lego head I love the idea!😊
I changed my roxshocks fork oil to redline equivalent as the original is super stiff when the temperature gets below zero and the fork transforms into a pogostick. The oil change made it back to normal. I think one could change the fluid in a reverb to a very thin fork oil, like redline likewater, or brake mineral oil that is more stable in different conditions. After all it's just a hydraulic fluid that moves a button on the other end.
For the rattling cables: I wonder if you could grease your cable housings and then fill the frame with expanding foam. Then you could pull them free and you would have nice snug tunnels inside the frame for the cables 😅 I'm sure this wouldn't work in real life though 🙄
Regarding the wheel lamp, you are referring to the "wife acceptancy factor". 😊
Loving that stand
LEGO CAPS, YES!! Going for Lego caps tomorrow with my boys. Make sure this guy gets full credit for historical purposes, 30 years from now we’re gonna wonder who started all this And that guy should get full credit unless somebody else can come up with proof like a time stamped photo. Trends that stuck, LOL!!
I love the wheel lamp!! I want one!!! superb!!!
HAAAAKSS and bodges, hacks and bodges, hacks and bodges.
I have a suspicion that chilling down the fluid before bleeding RockShox Reverb is just trolling.
Yep, its nonsense. Its just that he fid a bleed
Theoretically, if you bleed in cold fluid, it’ll expand slightly when warm and create more static pressure in the system causing any air bubbles to compress. Realistically, it’ll cause rubbing on the rotor if your brakes don’t have all the high end adjustments (reach in, pad in, etc). Maybe dropping the viscosity reduces mess and air bubbles???
Jeez cheer up Neil 😂
#GMBN Was that a Sam Pilgrim Lego head with the white helmet on?
Haha, certainly has the same smile
That wasn't a rebel guard, it was Blake!
That shock adjuster looks cast after 3D printing a wax form. I would of tumbled it and then finished it by fine sanding then wet and dry the outer surfaces to shine them up
Shoulda woulda coulda. U likely ride a 3 wheel.
@@bushhonky7936 you’ve obviously not got a lot to do. My comments weren’t abusive to the maker just a way to improve the outer finish and a comment of the process. I’m not sure what your reply is about. Moving on!!!
@@robertfynn7417 not a lot to do? Wanna swap places bud? Ill happily sit n talk about how id of done something better than someone else while you take my place, working 15 hours a day, 6 days a week to support a partner and kids you barely get to see, even on your day off.
Its people like you that really piss me off. Claiming i got nothing to do cos i made a remark about your comment which is clearly only there cos "youd of done it better" in your mind.
Whats wrong with the way he done it? It works dont it? Just like me, might not be pretty, but does the job!
Love yor videos! Keep doing cool stuff laike that!
I now have lego heads on my bike
Did they just fit right on or did you have to thread them or anything?
@@QuickCrimeChronicles I just put a hole through the stud on top and they just screwed on
Chop up an old foam kids ball and use a push it all in with an alan key , it's just enough to stop it from rattling!
Problem with the cold dropper post oil is that it will expand again as the temperature rises, which could result in a burst seal etc.
Love the hacks love all the video
Frozen hydraulic fluid, great when is cold, after a few DH runs it'll warm up, then burst seals.
the dropper won't warm up from riding
YES! He sang👏👏👏👏👏👏👏👏👏🎤🎤🎤🤘🤘🤘
RE: shock adaptor. If the person went to that much trouble to cast this piece, why not machine it to look nice and shiny? Looks good all the same.
I would solve the problem of rattling internal cables. By going online and buying some internal anti vibration foam. It's not even expensive from the blue online retailer.
I'm onboard that new trend!
Stuff it with bubble wraps?!
It's noo-fn-land, not New found land. If I have to learn how pronounce Worcestershire, you can meet me half way and learn how to pronounce Newfoundland.
Good point
Yes bye
Or Melbourne.
great stuff
Does a road tube really weigh that much, to change the weight of the bike/ I doubt it.
Polish the new mount he wnhh go I erred inn ally. It would look bling!
Sweet!!!
That fat bike makes the couch look hilariously small.
I'll teach you to weld if you coach me some mtb
Ashton is alive! Alive!
Tin of expanding foam.
solve my issue with by seat post!
Hacks and bodges, hacks and bodges, hacks and bodges.................
Niel 🙄
😂😂😂😂😂😂😂
If anyone has rebuilt a rear shock, you can understand that it does indeed rotate all the way around. Which pains me when someone went through all the effort to make a different bracket.
Yes! Glad I'm not the only one who wondered why they spent hours or days making a custom part rather than spending a few seconds giving the shock a twist. Plus, the shock now moves on an axis the frame manufacturer never intended, and doesn't move on an axis that they did intend. Seems like a huge folly of a project.
Martyn.....BEARD KING!
Feels like someone is having a bad day. You alright Neil ?
heat expands / cold - contracts
Depends on the material.
i bet a road bike inner tube would work short term.
the rubber could handle being inflated past spec for a short time.
It's not that overlyy inflated. Keep in mind that the tube is doubled - and bundled near the bottom bracket. I only inflated till the cables stopped rattling.
Super
LEGO heads. Will it work on my 2 year olds shraeder valves?
Fluid, as a lever, is susceptible to cold. If you bleed the reverb hose with warm (expanded) fluid, then go to a cold area, the fluid contracts and won't have enough push to activate the post. Check this video out from Butter Suspension : th-cam.com/video/SIYd1hz87Hw/w-d-xo.html