How To Fix A Bent Rear Mech | Mountain Bike Trailside Repair
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- เผยแพร่เมื่อ 22 ส.ค. 2024
- At some point during your mountain biking career you'll have the misfortune of damaging your rear mech. You might smash it on a rock, drag it on the edge of a rut, or twist it in a crash. Luckily, Doddy has some tips on how to straighten a bent mech, get your gears working again, and avoid a long walk home. Here's how...
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Going to say, with respect to "single use" master links... have never run into an issue re-using them--HARD. They don't blow apart like paper in the wind. We all carry a spare for many reasons. I don't think we need to call them "single use" anymore. I get it if you f*ck one up... but they're not generally that delicate. Love the show lads, keep it up!
KMC ones are better to reuse than Sram ones. I've actually had a Sram one fail after 4-5 or more times disconnecting and reconnecting. Still stayed on as long as there was tension but that was the only thing keeping it together. KMC ones I've never had issues with, even after many reuses..
I still carry a spare tho, chain can break on another link and thats when you need the spare trailside..
Same here for kmc links. Only change them to new when the chain is worn. Never had one disconnected while riding. The ones provided with top kmc chains feel much tighter when new and for longer, but my experience is mainly with the cheaper ones. Never failed
lol, he reused the link the in the video too.
LoL! For me, it often involved kicking and shouting! The shouting does nothing by the way.
Well, shouting helps a bit when you're running from a 🐻 bear, and need that extra speed. Obviously because loud cars are faster, the same rule applies to people. Pure logic 😂
@@polishguywithhardtospellna8227 I must admit I hadn't thought of that. Of course bears were extirpated in the Uk a long time ago.
😂😂😂😂😂
Nice instructive video 👍🏻
In reference to the missing cable end cap, i always degrease the end of my cables then apply industrial grade super glue. Only takes a couple of drops and haven't had a cable fray yet. Enables me to remove the derailleur multiple times for cleaning etc without having to replace the cable.
Good idea to glue the end of your gear cable. I don't know why bike shops don't do this.
I've been reusing links for years 👍🍹
Yep, me to, never had one fail in over a decade
same here, conneX chains..... worx!
When GMBN,GMBN tech,GCN,GCN Tech upload at the same time.
I know you're not supposed to reuse quick links, but I take my chain off a lot to give it a deep clean in kerosene and usually reuse them a couple times, never had a problem in years( knock on wood haha)
First thing would be to get off the trail and do the repair there...
I never understood why people drink, talk, repair etc directly on the trail.
...but thanks for the repair idea.
I think this is a very useful aspect of GMBN Tech. Field tech. I enjoy all the shop videos but segments like this are extra helpful because they deal with situations that happen out of the shop and have to be dealt with on the trail. Great! Thanks Doddy
Glad it was helpful!
To remove the chain from the derailleur, you don't need to open the chain. Just remove the lower derailleur pulley, loosen the screw for the upper pulley, and pivot the inner cage plate around the outer one to free the chain.
You could do to actually get off the trail Doddy ...
did he put the new link the wrong way?
I noticed the same right now.
Well spotted! The arrow should point backwards at the bottom and when you cycle it round to the top (to click into place) it should then point towards the front of the bike.
Seems he had the old one the wrong way too...
@@nicolaslaurent7006 ok so it was the wrong way round we move on... question I want to know is why does it have to go directional specific?
I don't know enough to have caught that.
I have a quick link (but i was told it's called a master link) on one of my chains and i paid like $15.00 Canadian to buy it. Then i found out they are supposed to be used only once.
So, i bought a chain splitter after that and practiced how to split and re-connect chain links by carrying around about 5 inches of cleaned chain and my chain splitter and practicing whenever i had some time.
Hey Doddy, didn't you mount your master link the wrong way ??? I've been told to mount mine (SRAM 10 speeds link) with the arrow in the rotating direction (arrow facing backward when on the bottom )... Am I wrong there ?
I've broken 2 derailleur hangers in short order and so didn't have a spare. Had to cut the chain short and install another link turning the bike into a "single speed". Got me home.
i think your my favorite tech always simple and dang did this just help me loads!! ,new hanger but still couldnt get lined up I thought the mech looked off , grabbed it like you showed gave it a bit of a tweak and boom chain noise gone all gears accessed ... was loosing my mind lol...good on ya Mate!
I'm by no means an expert, in fact I'm so much of a novice that I don't know how to break a chain, but when messing with my bike yesterday I removed the derailleur by disassembling it and removing the pulleys, instead of breaking the chain.
It's a lot more fiddly to get it back together, but definitely an option if you don't want to break the chain.
Had a few incidents where needed to turn my bike into a single speed to get home
same!
full suspension? I think it is not possible to turn a full sus to a single speed (at least without a chain tensioner)
@@totoxahc you are right, I have had to lock fork our and zip tie the chain to the chain stay to create some tension before - its not good as you need chain tightish and that effectively becomes a hard stop on the suspension then! Short - get me home - trips only!
What i've learned from this: always carry a spare derraileur with you, or, remove the derraileur completely and just setup the gears in a fixed position that could allow you to get home.
If there's anywhere I'd take a huge weight penalty it'd be the derailleur so it doesn't bend/break as easily.
@@gravitybassI think you would be fighting a losing battle , You would have to seriously beef it up to take big hits.
@@Jasontvnd9 … except my original derailleur that came with the bike in 1991 survived 30yrs of knocks and scrapes. The modern equivalent fitted when age finally took its toll has lasted a whole two months. It hangs at least an inch lower, making it much more vulnerable, and has all the strength of a wet lettuce. There’s no reason why the bike industry can’t make something tougher and better designed, except for wanting to sell you a dozen replacements.
I've not bent one without breaking the hanger. When NX Eagle first came out the upper jockey wheel would fail, ie. Fall out of the mech! This happened with 3 warranty replacements. I found rather than walking I could lock the cage lock and ride it with one jockey, very carefully but it beats walking in cleats!
And that #Shimano provided to Doddy the new rear mech 🙂
Reminds me when I had to hammer a bent mech hanger straight with a rock, in blazing 38 degree sun in S.A. Had propped bike up for a pic...and it fell over as I took photo...realised later when I shifted the mech into my spokes!
I like what you’ve done with your pedals doddy might have to try that with my mallet Dhs
The quick link is on the wrong way round
Since I run 12 gears an alignment gauge was best investion ever....👍👍👍
You can use a piece of string to unlock a powerlink. Can tie it somewhere on your bike so you always have it!
But not a lace from your MTB shoes. I've heard a story about two mates going home with the link unseparated and a lace missing from one of their shoes each. 😂
@@polishguywithhardtospellna8227 That's hilarious 😂
Those pedals 😍
#AskGMBNTech Yo Doddy!
My SRAM mech cage (not the hanger) is really bent out of shape and not giving good shifting.
Would love to see an in depth video of how to sort that out on the bench, lots videos about straightening on hanger but the cage is more black art.
Excellent video. very good instruction and visuals.
7:39 If you use a lighter to heat the cable up before you cut it down, this won't ever happen
If it's required to remove the derailleur and cage to straighten these out wouldn't it be possible to undo the pulley bolts first which would free the chain, saving you having to break the chain / remove the quick link, do your careful bending, then reinstall the derailleur, guide the chain around the jockey wheels whilst redoing the cage? Why waste a quick link when you're already going to have to undo the derailleur cage.
Ahhh, so that practice hitting the GX AXS proved useful to set up this video
Mr Dodd...mid..60 K ride. . My hanger snapped in the middle of nowhere, in the woods.. I I had bent it previously , this time it broke on impact ! I flipped my bike over to look at it, and a guy walks up and asks me how I'm doing...offered a ride home!! Yup. all the way in his pickup. Lucky as hell.. I did have a spare at home. Thanks !! Be safe
Often you can set it up as a singlespeed in one of the middle cogs, you just have to choose the one that gets you any sort of chain tension.. I'd take a ride in that pickup if offered ofc, but even singlespeed gets you most of the way home.
@@RenaxTM91 Yeah. I was about to try it...but the ride was a once in a lifetime..? I was truly in the middle of the woods. Thanks bud.
That chainstay protector looks badass
And just mention to those who are watching without a lot of experience, get well off the trail to work on your bike. Please don’t become a dangerous obstacle
love your videos
I learned a lot from them actually almost every thing I know about mtb
My tip to stop cable fraying...when u cut a fitted derailleur cable, using gloves smear some super glue into the cut end and quickly twist so neat/together. Once dry fit end cap...then if u remove end cap as in this vid, cable should resist fraying. Or solder it.
A spare hanger for your specific frame would be worth carrying for this reason, otherwise you could disconnect the mech and run it as a single speed for the trip home
Sometimes it's the cage of the derailleur though. Not always the hanger
Quite a few bike design involve a large spanner for undoing the hanger, which I didn't realise I need to carry when I did carry spare hanger. This ridiculous situation might end though with sram UDH
Wow. That would probably take me 5 hours to do at home.
I can only imagine myself stuck on the road somewhere splitting the chain, removing the gear cable, removing the derailleur, taking apart the cage and removing the jockey wheels, bending the cage straight and then putting it all back together again. It would be great to know.
For some reason, my gear cable is always frayed. I would like to know if the bike shop does that so i would need to buy a new cable the next day if a problem started lol.
I do have a chain splitter and have used it so that's one thing i can do, and i have bent the hanger straight before with the derailer on the bike by using an Allen key. I have taken apart a jockey "cage" before to replace a jockey wheel but i forget how that turned out, it was so long ago.
With my luck, i would lose one of the many small pieces in the grass or on the road and really be stranded with my bike reduced to being a push-scooter where i stand on one peddle and use the other foot to push me forward.
To do all of this, on the road, seems logical and a must to do when stuck somewhere but wouldn't it have been much faster to peddle home in a working gear?
love it, only way to go.
#askGMBNTech Is it possible to fix it to the derailleur to a point where I can use it as usual?
Buy a Wolf Tooth road link, you can still dial in the rear derailleur and the road link (not by design) has a sheer point. Install the road link between the factory derailleur hanger and your derailleur. Cary a spare road link in your pack or just reinstall your rear derailleur directly to the factory hanger. I found this out by accident slipping off of a skinny on the right hand side. Basic bike multi tool is all you need to get back to riding and hopefully no need to take off the chain. $20.00 insurance policy...
I think a bent cage is very rare...usually the hanger....
I've got 3 bent cages in a box somewhere, 2 of them on the same hanger, and I still use the hanger..
Just depends on what you hit and how you hit it..
I bent my derailleur on the first ride on my new bike
Great video
Is the split link arrow pointing the correct way at 10.06? Should it be pointing in the direction of travel..
Need a video explaining how to correct a bent swing arm ...Help!!!
Given ur taking the cage apart, no need to split the chain...
excellent!
Nice video make some more like this video
Sorry Doddy, I do NOT carry rubber gloves in the wood.... 👍🏻 good job again!
I keep them with my tool kit.
Felt of a skinny and felt on the derailleur, it got into a 45° position from its original position... didn't snap and was able to bend it back
Hi Doddy! Just watch this video because recently my rear derailleur bent excessively, may i ask a walk through video if your on your work shop on how to fix with a tool. Thank you for helping me out, love, from your Filipino fan! #ASKGMBN
I like to remove the two wheels from the derailleur, instead of breaking the chain, and taking it off that way. Also give me a chance to clean the wheels.
My Derailer is bent not the hanger jut the deralier itself and i was watching a park tool tutorial on how to adjust the Derailer so it shifts smoothly and i could not get it to work lucky i noticed it was bent i lucky have another derailer so i will just replace it
Let me guess, doddy had another video in mind when he accidentally just so happen to bend his derailleur hanger, and improvised a video on the spot.
🤔
Well even if he had done it intentionally or not, regardless its information we need to learn, those of us like me who are new to MTB. Was a great video 🤙
Shimano rear derailleur 1x12 should be slightly bent. It is not perfectly straight when you have brand new one. Is it possible to realign it to the right "bent shape" when it is really bent? (at home)
Yeah LOL, i saw my bent derailleur and thought it needed repair. Turns out these shimano things are supposed to be bent. Trying to straighten it out wont work, the holes of the cage wont line up any more. So keep it bent like its supposed to be ;)
I’d replace it as soon as I got home. It’s not worth risking a £1000 rear wheel
Doddy, you used the Topeak Power Levers as far as I can see. On their website, they claim these don‘t work with Shimano 12x Quick Links but it worked no problem for you. Can you clarify with them why they claim that? #askgmbntech
Just bent my derailleur but also snapped a spoke so yh had to walk it back to the car park
To get the mec off you could also just unscrew the pulleys. So u dont waste a master link
Just remove one and loosen the other, yep! Work smarter not harder.
No need to waste it, I reuse masterlinks all the time, only had one fail after 4-5 uses (Sram, KMC's are better).. And you'll know when connecting them that its too lose, it won't snap into place, just glide with no resistance..
The arrow in the link seems to be facing backward
My friend had the same issue. His chain was fully off and jammed and the derailleur was bent a little. My other friend said “pedal backwards” the chain caught and the derailleur bent fully in the wrong direction. He couldn’t pedal because now the chain was really off. Ironic that there is a way to fix it.
#askgmbntech Is there a way to clean a shock pump? Does it have a core like the male part? My expensive digital shock pump isn't holding pressure and I know the threads are good.
#AskGMBNTech I currently have a Cannondale trail se 2, it currently have a 120mm fork on the front and I was thinking of upgrading the fork to have 150mm. Do you think this will be a good idea?
If you guys actually speed waxed your chains, instead of constantly promoting Muc-Off, you'd find a world of differnece in how clean working on problems like this really are ... lubes are so 90's
Why have we not evolved to a better option than having such an important part of our bikes being so vulnerable?
I work in a bike shop and worst thing is brand new bikes, out the box hangers are bent already! It's ridiculous
I always carry a spare derailleur hanger in my jersey's pocket when racing, you never know whats gonna happen.
If you need a derailleur hanger during a race you've already lost... Also never swapped a hanger without also the derailleur needing to be swapped...
@@RenaxTM91 racing is not about just winning.
And it sometimes happen. Finish 3 minutes later is still much better option than DNF! If you can finish regardless what position, you won. If you cannot finish due a small problem like this, thats really annoying.
Sometimes I wonder if a single speed would stop Doddy from breaking so many parts and limit his visiting bushes...
#ASKGMBNTECH Why are those links single use?
#ASKGMBNTECH I bought new bike, was converting it into tubeless, i put wrongly the tape, and then i noticed hissing from nipples. (thats how i knew the tape is not sealing correctly, then i heard louder hissing comming from oposite side to the valve, and it was comming from the welded joint quote strongly. Please tell me that regardless if the rim is tubeless or not this is an failure of rim production and its factory issue? and that regardless if the rimis tubeless or not this welded part of the rim should be sealed and welded so there is no gaps to let air thru.
Nope. You said yourself you put the tape on wrong. The tape is what seals the rim bed against the air. A good taping job is critical to a proper tubeless setup.
@@mattgies yes I agree with the tape sealing it up. I understand why it hissles on the sprocket mounts - there is no issue there.
That said, I also know that welding a rim is called precise welding. and for me, that means that there should be no gaps in the welded part, and by extension, the air should not escape from rim's weld.
That said i am looking to hear from any1 who could answer that.
Mine is twisted at an angle
#askgmbntech somehow I bent only the 4th and 5th cassette rings. Can I bend them back or do I need a whole new cassette?
Just try, what have you got to loose? I've done it with 8 and 9speed casettes, usually won't be perfect but good enough to ride until you can get a new one...
AXS/XTR users: sobbing
Why does Doddy keep saying "down into the higher gears".
As an immersion chain waxer I always chuckle at cyclists that oil their chains and worry about muck on everything.
Who uses a fresh link when removing the chain? I always reuse mine, and no issue...
I just switched gears and my gear slipped and broke my derailer…
Take the mech off and make the bike a single speed
Bit more welly? I can't understand much of what he is saying.
You could put it in your Range Rover and drive home. 🤫
Shimano turn off clutch, sram quietly leaves the room
Huh? You can lock sram
So ... Hack or Bodge?
Bodge for sure. This is a "doing what needs must to get home" type of repair.
E
This was painful to watch....
Bonus: if you have to take the cage apart like in this case there is no need to break the chain to get the mech off. Actually that's what I usually do. Rather than breaking the chain, which is a bit annoying for me, I'd rather undo the screws to take the cage off and free the chain that way.