Tighten Bolts Correctly On Your Mountain Bike | GMBN Tech How To
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- เผยแพร่เมื่อ 4 ต.ค. 2024
- Over-tightening bolts can damage your MTB, and is easily done when using a normal Allen or Torx key. This can be avoided by following Doddy’s guidelines and most effectively by using a torque wrench.
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We’ve all done it, damaged the head of a bolt, stripped a thread or even damaged the components you’re assembling. It can be avoided using normal tools however using the correct tool, a torque wrench, is the best option. Doddy talks through methods for both options to help you keep your Mountain bike in good working order, but most importantly, in a safe condition.
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Also, don't use the ball end of an allen wrench to apply final torque to bolts that require higher levels of torque or you will begin to round out the bolt's head.... Use the flat side of the wrench as that's what it was designed for.
Here's a tip I've been using for years for brake levers and shifters: leave them a bit "loose", tighten them enough just to be in place. If you fall, and the levers hit the ground they will "spin/move" instead of bending or braking.
EDIT: Posted this before the end of the video... Doddy mentioned on the end. :)
thx for the tips Dude
A hack I do is, make a label with a label maker of what component and the nm for it and then slap it on my repair stand, this has saved me lots of time as a lot of the parts on my bike does not have nm printed on the side, so I don't have to try and find the manual for it or find it out online when I forget. But this might not be much help if you work on many bikes
Great thinking. Very solid hack.
Done a similar thing as I was building my new bike, except in to a Google Sheet then printed a copy to put on my fridge 🤙
That's brilliant!
Robert Daborn i
I knew all of this, but I still found Mr Dodd strangely compelling. He is a really good presenter and teacher.
I recently got a torque wrench and I am soo shocked how tight I have been doing the bolts Everyone needs a torque wrench
Great vid as always, however you forgot to mention that most torque wrenches don't work both ways and you can ruin your's if you try to loosen bolts. Also it wise to release the pressure of your torque wrench every time you put it away, cheers.
One thing I find with spring-loaded torque wrenches. When done using it. un-wind the adjustment so the pressure is off the spring. This lets the spring stay in its natural state.
Great video Doddy will definitely look at getting a torque wrench this week thanks for all those tips cheers 🍻
Thanks for the comment Nick!
Great tips Doddy.
Derailer hanger bolt, Chain ring bolts, shock bolts, suspension pivot bolts, and saddle clamp bolts are ones I see on the regular at the shop.
So you're saying you've seen a bolt 👏
for the steerer to stem and stem to bar interface, fine sand paper (1000 or 1500 grit) does wonders... always sanding in a straight line against the direction a part could potentially rotate (vertical on a steerer/adjacent surface, horizontal on a bar/adjacent surface). Just to remove the gloss. The fine complimentary scratches will lock the pieces together when clamped. Clean with alcohol after sanding - no grease! However, grease the underside of the bolt heads and bolt threads well for accurate torque specs. No slipping, ever. Worked in a shop for many years. Especially useful for slipping road bars. Of course, this may affect resale and do at your own risk - use the anti-slip grease if you're more comfortable. That being said, performance wise, this method works better than anything else. cheers.
Hey Doddy great video but I think you should have mentioned that when buying a torque wrench to check if it works both ways. I myself had that problem when trying to tighten my pedals.
Square taper cranks 8mm fastening bolts are a super common one too. Especially on the left crank.
Almost always loose.
Should we tighten these crank bolts super tight?
It’s interesting you post this today. My motor had started to come loose from my frame and I found one of the bolts floating round in the motor case. 🤦🏻♂️
So where are the setting specs for the seat, handlebars, seat post, brake levers? I did not find those specs from trek. found lower-end components.
Exactly what I came for and still can't find.
Intense sends you a really good torque wrench
I just used mine on the stem today and the click is really subtle, hoping it’s not to loose! 🤦🏻♂️
The small pre-set park torque wrench 4-6Nm is a Cam over so you can't over torque. The normal "click" style you can and just like a lit firework never go back to it once it clicks don't give it another tester click... general good practice is to go to your desired torque in increments.. 50%>75%>100% and remember to store you Torque wrench at its correct storage Torque or you mess up the calibration (normally it's lowest claimed setting e.g. 2Nm for a 2-20Nm TR.).
love those nukeproof megas
Great info! If you check a bolt with lock tight, could this potentially break the bond if it moves a fraction? Should I rather just always remove these and reapply lock tight again?
My pedals are seized and rusty af the mountain bike was neglected for a few seasons and left under a deck. Any tips on loosening the Allen key bolt? Also the other pedal has a bolt that requires a crescent wrench. Thanks for the vids you and the mustache guy have been killing it and helping huge!
#AskGMBNTech what difference does a thru axle make when compared to a quick release axle?
The medium torch wrench is more subtle old bean not less!
Definition of subtle
subtler play \ˈsət-lər, ˈsə-tᵊl-ər\; subtlest play \ˈsət-ləst, ˈsə-tᵊl-əst\
1 a : delicate, elusive a subtle fragrance
b : difficult to understand or perceive
Love the show BTW! Keep'em coming :-)
Even using proper tools you can’t help but on occasions round a bolt sometimes I’ve found bolts to be too soft alloy ones especially.
NOTICE: Bar clamp Torque (5nm)is much lighter than steer/stem clamp.(way tighter👍)I learned this the hard way. Bars went left and the forks went right on a drop hazard into a creek.😂✌️
8:40 I have this exact problem with my Mega. The rear shock bolt needs tightening after every ride because it’s always working it’s way loose. Even with the thread lock in
Is there a guide of newton's to use the tool?
GMBM TECH. Hi its not a mountain bike question but where did you get your watch from?
I remember it as, "pedals tighten as the wheels roll forward and loosen as the wheels roll backwards"
I usually take a mental detour through precession forces and infer the correct way to tighten the pedals. Next, I get unsure because it sounds counter-intuitive, I remember the thing IS counter-intuitive for most people, wonder why I would still think it's wrong (given that I understood the mechanisms at some point in time) and have a look at a spare pair of pedals.
Omg thank you!!$
@@koko-lores Right pedal right hand thread...Left pedal left hand thread !
You guys just forgetting one important thing. Torque force is changing by the length of the handle and also the length of the adapter as well. :) So keep in mind if you set up a torque power that will be a bit different from the real requirements.
My back wheel keeps touching the brake now. I think it moved but is stable.
My derallieur hanger worked itself completely loose. The clamping force of my axle was the only thing keeping it in place.
I didn't know you could replace crank arms individually. Mine came loose and rounded off the square taper. Didn't want to buy a new chain ring set.
A bit off topic but i did not know that wheelsize includes tyre aswell well it does on mine is this normal pls cheers
Can you attach Child carrier
12:35 HAND!
What is the most commonly size cone wrenches used to service a hub.
I can’t get the stem bolts off with an Allen key the assembler over tighten them idk what to do
Awesome, thanks man 🤘
What nm do I tighten my caliper bolts after I go to realign the break calipers? I can't find the specs on it...
in lift lines, not super uncommon to see loose brake calipers, perhaps because of incorrect initial torque or lazy adjusts on the trial. Fun to inspect others bikes, of course.
thank you for a great vlog I've subscribed and hit the bell button
I've head my rotor bolts come loose on a really hot day, while hiking to a hill and sending it down on a trail. My brakes squealed alot back then, they were old avids, so I didnt think much about them that day. My marzo bombers got eaten away by the bolt come loose. Thankfully it didnt crack but it ate a good 5mm away from the legs :/ Noticed it at home only
I use a drill as it has the torque settings and it works fine, just go slow so you don’t strip bolts
Missed a lot of bolts LOL. This video doesn't seem like it's for mountain bikes, but more for non mountain bikes, because mountain bikes with full suspension have WAAY more bolts.
how do i install volume spacers on a rockshox deluxe? i opened it up and seems to be different from the monarch
Great one Doddy! Thanks mate.
Our pleasure! Thanks for watching and commenting.
Hey can you guys do a vid on internally lowering forks ,I wanna build up a dj frame and would like to know how for that build thank you.
While its not directly on the bike, but might as well be when you're out, check your shoes cleat bolts. The slow realization when you know you're going to flop down next to your mates isn't a proud one.
8:25 is them bolts are loose could it make the whole back end of the bike wobble
Doddy I really need your help I have an Allen key rear thru axel I dont have a torx wrench only a hand multi tool what's a genral mark to know when you've hit 11nm
Can somebody tell me the max torque of the bolt from the star nut?
Thanks
Hi, are reversible ratchet torque wrenches capable of torqueing counterclockwise?
Most of them aren't, so you have to pay attention to the specs. Clockwise-only torque tools will have an arrow indicated on the tool itself that show its torquing direction.
Hi Doddy a great video. Where can I buy a torque wrench system ?
12:40 is that a 3rd hand, like the tool?
how to untighten and tighten bolt on alloy frame if i don't have torque wrench?
Standard Allen keys or Torx keys (depending on the bolt) will do it. But if you want to get them to the right tightness, it's worth investing in a torque wrench
@@gmbntech thank you guys
Who‘s Hand was it at 12:36 ?
hi doddy, i just cleaned my bike today,then i decided to check my bolts, i have my shimano slx m675 ispec b shifter, it so happened that i stripped my bolt hole,and so the bolt doesn't hold on to my handle bars anymore. is it possible for it to be repaired?if it is, any tips in how?
thanks doddy!
#askgmbn
Speaking of Torx bolts... Someone got a recommendation where to source MTB bike appropriate Torx bolts from?
I imagine Torx bolts being a small step safer than HEX ones when it comes to casual theft of parts of my bike but somehow I just can't manage to find a shop that would sell like a large assortment of sizes, lengths and color ( black anodized or titanium preferred ) ones.
Durahl somewhere like accu.co.uk?
awesome vid
Doddy, what u doing clicking that torque wrench multi times dude, thats how u over torque! Should only turn a torque wrench smoothly and continuously until it clicks..Once! Not then 'bounce' the wrench as that usually tightens more...one click is enough. If u need to check a bolts torque, loosen it 1/4 to 1/2 a turn first...
Just saying cos viewers will copy that....great vid tho...
I think he was doing it to demonstrate how the wrench indicates you have reached proper torque. But good call on one & done.
#TOPMODS I have a great topmods entry for some Hardtail Love...... That sounded weird :D . My Specialized Pitch 650b, everything changed just the frame. Nice suttle Anodised Red features. Black, White and Red bike. Where I send the images?
Nice vid
Close where I live a school opened for learning Biking mechancs its 50 hours and are charing 500 dollars, how good is the pricing?
Depends, how good is the school?
Well when you can learn online for free and spend that money on tools and equipment seems stupid
Check your wheels are tight? Well comes a bit too late for me watching this video. My front QR skewer came undone on the trails today.
ALWAYS use a torque wrench, otherwise you risk voiding the warranty on your bike and parts due to negligence and poor maintenance (in addition to breaking your bike). NO SUCH THING AS "MUSCLE MEMORY" with gauging torque values.
You spend thousands on a bike and accessories, so WHY wouldn't you spend a less than $100 for some good torque wrenches???
And the spoke nipel
Right timing! I've just come from a ride where my handlebars rolled due to loose clap bolts, just as I cased it on a 4ft hip gap
Ouch. Hope you're alright. Hope the bike's going to be OK too!
Love the Channel ! Regards from Chile !
Thanks Seba!
I need wrench my hole bike is rounded off bolts an threaded screws mix n match on mine lol
That sounds a bit sketchy Callum. Get it sorted as soon as you can!
How do you ensure that a torque wrench is calibrated?
One quick and dirty way to check if a torque wrench is in the correct ball park is to clamp the drive head (the part where the socket attaches to) in a vise or something similar and position the wrench so that the handle is parallel to the floor in the 3 or 9 o'clock position.
Now we can use the formula: 'moment = force * distance'. By using a weight at the end of the handle we can test a certain moment on the torque wrench to test it's calibration. For our purposes: 'force = mass * 9.8' is a good enough approximation, so the force applied to our wrench by a 500g weight would be 4.9N.
Let's say you have a 10kg weight you can attach onto the handle (preferably as near the end as possible), that would apply a force of 49N. Then measure the distance from the centre of the drive end to the point at which the weight is attached to the handle. For example this may be 0.1m (10cm). In this scenario the moment = Force * Distance = 49N * 0.1m = 4.9Nm. So if we set our torque wrench to 4.9 Nm (say 5.1Nm) it should not click.
In reality your torque wrench does not typically need to be very accurate, and a deviation of 10% is more than acceptable for home use (for example 5Nm +/- 0.5Nm, or 2.4Nm +/- 0.24Nm).
give that man a cookie!
Ammar Chaudhry I tutor physics at my college and didn't even think to do that. Outstanding
Fuck that I’ll just risk it
Please do a vid on how to pump up yout tires.
tom scholfield hasn't MBR already done that video?
You want a reliable and good quality torque wrench get a snap-on or wera.
If it comes loose it wasn’t tight enough to begin with. A hose clamp on my car kept coming loose so I hit it with a power tool and it’s been solid for over a year knock on iPhone...
After tight comes loose.
Wish I would have seen this before effing up two carbon handlebars... ='(
No issues with assembly for me th-cam.com/users/postUgkxHL1v1R3NE5x4KiYfyt8dnQmyNYz7qi5L but I could see where some might benefit from using an experienced bike assembler/mechanic. I'm an older rider starting back after a 10 year break. This bike exceeds my capabilities and has been easy to get comfortable riding. I'm mostly on easy trails with almost no street riding and have not been disappointed with the performance of the bike. My fitness level is far below what I previously rode with and because of that the mileage is going on the bike slowly. While I'm losing weight slowly, the bike seems to tolerate my 220 pounds just fine. The bike has been used by several family members ranging from 5'5" - 5'9".
Using flats?
12:36 lol
Anyone rate the Icetoolz Ocarina torque wrench ?
Never stay use common sense unlike you and me it’s not that common anymore 😂
Doddie, The only way to correctly tighten a bolt is using a torque wrench. There is nothing called muscle memory to tighten the hardware. This is something that frustrated me about the GMBN channel, showing fixes without using a torque wrench. The only time to not use a torque wrench youis on the trail repairs. Please promote the correct way to tighten bolts.
J Dub you do get a feel after time.
The tolerance of bike parts beyond pivot point with bushings or bearings are large and a range of torque (e.g., muscle memory, perceived torque, etc.) will work just fine.
bryan rut exactly after amount of time you get a feel of how tight bolts should be, fitted some new pedals recently didn’t use a torque wrench just nipped up lightly and after two weeks of use not come loose yet. However I do use torque wrench on crank arm bolts
16 mm too lol race face 🙄
Why you have a pizza cutter in the background ?
last byte because it’s a park tool one and ther sponsored by park tool so they need every park tool tool