Straightening A Bent Chainring
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- čas přidán 14. 10. 2015
- I show how to repair a bent chainring (chainwheel) on a bike. I bought this bike used (A vintage Legnano), but it needed some work. The chainring was bent when I got it. The tools I used were a screwdriver, an adjustable wrench, and a VAR Chainring Straightener tool. But the job could have been done with just the first couple tools. I could have used a travel dial indicator as well, but I don't currently have one. At worst, if I was not able to straighten the chainring, then I would just replace it.
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I fix bikes.
Thanks RJ. Worked like a charm. I only had a small adjustable wrench to hand but with a bit of patience the chainring is now spot on.
Thank you so much for making this video, I recently got a vintage Peugeot for only $40 and I'm in the process of restoring it thanks to this video I'm now one step closer to get up and running.
Dropped the MTB - very bent 42T outer chainring - first straightened in bench vice and then on the bike with large adjustable wrench - looks good, rides well. Thanks for the video
I would love to see a collection video of all your bikes and what you've done to each one. You might want to keep it under an hour though. :)
Thanks mate saved me a lot of agro with my kids bike, the chain ring is made of some kind of cheese I think.
Thanks RJ! I just bought a bike for cheap and it had a bent chainring - didn't even know I owned an adjustable wrench until I went to check and sure enough this fixed it! Thanks!!!
This is exactly the problem my dad's pre-1985 Peugeot P8 has. The big chainring is warped to the extent that the chain just shifts by itself between chainrings as you turn the cranks. The warping happened around 15 years ago and I was always scared about trying to fix it, but I might give your fix a shot. Thanks for the video!
Thank you ! I got a slithly bent ring , and because of that , the chain were hitting the metal thing near the ring. The technique helped me and I fixed it !
Thanks dude! You saved me having to buy a new chainring!!! Big ups!!!!!
Yet another one that helped me out. Thanks RJ!
Master !! It is and always be a pleasure watching your videos!!
Thanks RJ! You are awesome!!!
Super helpful. I wasn’t sure what to do for my bent chainring til I saw this.
Great advise. Thank you!
Thanks for this man, seriously helped me out!
That is good RJ, thanks for sharing.
As always..thank you very much RJ
Thanks a lot man. Able to apply the hack for my bent cog. More power to your channel.
Thanks for making this video. Saves me money and time to go to a bike shop.
Thanks RJ, just saved me from buying new (and expensive) chainrings! Great vid.
Thanks RJ for the reply
RJ the bike legend.
This can be a real problem! My large chainring was bent inwards in a couple of places- not much, but enough to make the chain jump onto the middle ring every so often. Thanks for the video, I got it straightened now.
Thanks once more! A personal note: I find it rather cozy the way you walk around in socks in your work room. Appreciate it!
I see I'm not the only one wearing Park Tool's Kevlar Bike Mechanic Socks.
I got my brompton clashed and the chainring was bent. I was worrying how much do i need to pay for another chainring. You saved my life! Thank you so much!
Thanks. Very helpful.
Thank you Rj I just got a trek 6700 I had a similar problem.
This is the only expert person who can fix the cycle in every way...more power to you #rjthebikeguy
#makeraimispiderman4
Really good vid that tool is great (VAR Chainring straightener and what a great idea to about the dial for finer tuning
Thanks RJ
Thanks my front cog had the same problem I’ve straightened it out to your instructions works perfect now thank you
I thought you were a big rich guy that pays people to fix your bike? Wanker
You are the best in the world
thanks for the tips
you helped me, thank you
Wow thanks man i just have an old bike (borrow it from my friend) and the large chainring is bending so i reluctant to use it. now i can fix it
Thank you, I am looking for something about converting a rear wheel from QR skewers to regular y axle and bolts and o stumbled on to this which I also needed! Thanks for another great tip video
Y axle? Do you mean like a solid axle? I am planning to do a video going from a solid axle to the quick release axle. You can always watch it backwards.
Thanks RJ, will be looking forward to see the one and reverse it, appreciate the response
*Thanks man that was helpful....great*
You are a star
Nice, thanks dude.
Thank you
RJ, you are a genius!
I have the same problem, I am going take the chainring off and use a work bench vice. Nice video
Life saver
This happened to my middle chain ring today just as I was almost wiped out by a truck. Glad it can be fixed easily enough. Cheers.
stay safe out there brother
Good vid thx👍🏻
Brilliant! I've just bought an old Falcon 10 speed that has this problem. Hopefully i can now save the chain ring.
Update! I used this method and it worked great. Thanks again to RJ The Bike Guy!
Magic
Good thing you were wearing your steel toecap safety socks. :)
Great as always. ta
Thnx bro
I needed this. Love you RJ!
I hope this will work on my old Ezip 500 electric scooter!. i did try to do a chain/sprocket alignment.
But i see the Sprocket is bent a little and is making the chain get really tight in an area and fall off at times!!...
God i hope this works i have a bad hip and this little scooter makes those small food store trip errands easier and faster to get done!
Thank you so much I'm glad I can do this and not mess my sprocket up! Lol cause mine is bent badly lol
Is this works on newer shimano chainrings?
Thanks much saved me somee $$
thanks for the vid, i need all the help I can get, also I don't feel so bad about my socks and crocks footwear in my garage
Is it necessary or better to remove the derailleur?
Used adjustable wrench just like shown in this video to straighten the chainring on my Trek fx 3. Thank you for the video!
l have a trek fx3 too and my chainring got bent when I crashed my bike. Used adjustable wrench got the 2nd gear to work again!
Mine isn't nearly as bad but its a Shimano sora on the biggest chainring and it hits the derailer pretty I might just try this the fix it .
Wrere did u get that tool from
On the other side is that a ring to keep front gear on the bike. Thanks Dan
Does that take a special ranch?
I have a bent (in) crank arm, do you have a video for that? Thanks.
Probably just replace it.
Would this also work with a carbon frame?
Yes.
Any videos on straightening the spider portion of the crankset?
If the spider section is bent and I am I assuming it's aluminum, probably easiest just to replace it.
Thanks. The spider is from a vintage Shimano 600 Arabesque set so I'd like to try and salvage. Others have suggested mounting in bench vice, placing metal pipe over bent arm and gently bending. May give that a shot if no better ideas come along.
Hi I'm after a bit of advice I've got a Peugeot hle premium from the mid to late 70s. I like the bike and don't want to change it..... But I'm struggling up hills (I know do more hills to get better) so I'm thinking about swapping the chain rings from a double to a tripple. Its a six speed cassette 14-28t (I've changed it to 28 from 24) everything else is original and wanted to know if it's possible before I purchase the parts.
Thanks in advance
You should be an orthopaedic surgeon, you have the finesse they require.
they require a few years at school as well
what is the tool bar u using for straighten, name of the tool
VAR Chainring Straightener.
Hello I have a chainring problem. I should have taken pictures before disassembling. But I have a Nevar chainring set I don't know how to put back together. Do you have a video that assembles a chainring set on vintage bike
Sorry, no I don't. You can probably google images of what it is supposed to look like.
I was told a new chain ring would be needed by bike shop. I have to try this on single speed chain ring and get back to you...
Steve Auguste Well?
its a hit or miss, and its free to try, can always replace it
I recently discovered your channel. Thanks for all the great content. What bike repair stand do you recommend?
+asdfjkdjsalkfj I have one of these that I like: www.amazon.com/exec/obidos/ASIN/B000OZFJS4/ref=nosim/youtube25-20
But I have others too that are okay.
I'll second that. I prefer to do work like this myself, and your channel provides a wealth of knowledge. Thank you RJ for keeping the videos concise and also honest for not trying to sell us tools and equipment.
I thought I need to go to machine shop but I think this should work. I have a hollowtech crank arms and put the 2 chainrings from 3x square tapered crankset and the largest chainring has at least more or less 7mm wobble. Just wondering what are your thoughts in my situation?
Thanks a lot!
I can't give you a diagnosis without working on the bike.
@@RJTheBikeGuy It's okay. What I did is manually adjust using the adjustable wrench to straighten up the chainring. Thank you for your content. At least it gives me the confidence to adjust it manually lol!
Out of curiosity, what is the cost difference between buying the special tool and buying a new chainring?
+Todd Moses You can probably get by with just the screw driver and adjustable wrench.
Would you use a hammer and flat body dolly to fine tune the teeth? Just a question-loved the video!!!
I wouldn't.
Hi RJ. Thanks to you, this video realy useful. Can you show how fix puncture on tubular tire? Its should be very intresting
I highly doubt RJ will get a bike with tubular rims/tires, anytime soon.
+Fixed Gear How To's The bike in the video has tubulars. I actually have several bikes with tubulars now.
+RJ The Bike Guy .... Can you describe the benefit and the deference between clincher and tubular tires on the performance side of things..I've never really ridden tubular. They say that is more faster and feels better on the road ?
+Stef Trekoff I have never ridden them either. Tubulars seem to be great if you have a support vehicle following you with a set a spare wheels.
Stef Trekoff tubular wheel is realy great, its like flying. that wheel and tire is lighter than clinchers - thats give better dinamic of ride. but if you puncture tube - its disaster
It looks better min is gust like that
I suppose this is the easiest and fastest way to do this, but would taking the chainring off and flattening it in a press or between flat weighted surfaces be more precise?
+ECsponger2 Actually I think this is easier and faster since I didn't have to remove and install the chain rings. Also when bending metal like this, you usually have to have to bend the metal passed straight, because it will spring back some. So putting it between flat surfaces like that might not get it completely flat.
thank you, i think this could be whats wrong with my bike maybe :(
How would you use those methods on an inner, smaller chainring? Seems that those tools may not fit in between the space of the large Chainring.
Then get a different tool. Or try something different. Take the ring off. Figure it out!
Nobody is more condescending than a sober Canuck
Hey buddy.. I have a Specialized FSR Sport.. the middle chain ring or whatever has some very low teeth.. causing the chain to slip.. I think a repair is close to $300. Is there a way to fix this cheaper? I.E. Grinding down in the gaps making the teeth bigger/deeper? Thanks
Buy a new chainring. It shouldn't cost $300.
$300?? What the HELL, man? Even a titanium one wouldn't cost that much!
So how to fix chainring that bite the rear fork? I think I need some help about it I already try to put a spacers on the Axel but it still it didn't work I don't wanna take a risk to bent my rear fork or grind my bicycle chainring.
If your chainring is hitting the frame, you have the wrong bottom bracket size for your crankset.
@@RJTheBikeGuy might be but I think my chainring was not well made maybe if I grind it and hammer it a little maybe it will work XD
talking about cranksets, it is oddly disturbing to find that the good ones that are like the one on this video are being replaced by a new design that was introduced a few years back, the ugly thing is that it has become really difficult to get the old type, specially if you are after a short 152mm crank arm that features 3 steps (3 gears/rings)... it is just difficult and perhaps a tad more than difficult, now prices, the prices can get to be oddly expensive, so one may end up having to buy the new system by force.... ggg not nice... the old system worked fine for decades and it was simple to customize the new one features a increased price that increases the cost of the vehicle to a point where more criminals are motivated to keep stealing bikes... gggg.... by the way please note that most crank lengths being sold are the 170mm and 175mm, this despite the fact that a ton, (more than half), of the riders are shorter, this being woman or men... this seems like a clear oversight of the ppl sourcing these parts.... ggggg the problem seems to be world wide....
Would bent teeth (nothing as extreme as shown here) be the most usual suspect for my chain continually falling off while pedaling? Im a novice.
Susy Liberato could be it also could be the limit screws on the front derailur you will need to adjust them
All fine and dandy until you have to fix the inner chainrings. If it's one of those riveted chainrings, then the only option is hammering or using very thin nosed pliers one tooth at a time. Particularly odious if the outer chainring has a non-removable (riveted) guard, as well. Yeah I know, the only real solution is replacing the whole shebang...
Hi m8 what's the name of the tool you use and can you send me a link please many thanks.
VAR Chainring Straightener tool. I displayed the name in the video. It's also in the description. You can shop for it yourself.
thank u
idk whats wrong with my bike, seems like chainring straight but there is a horizontal wobble.
use a zip tie as a gage.
Just a tiny correction: the name "Legnano" is pronounced "Len-YA-no"; the "g" is not voiced. Just like "Pogliaghi", which is pronounced "Pol-ee-YOGG-ee".
Rcently got my crankset outer right bend cause my crankset fell on a corner of stone pillar, what a sad thing
No Don'mop biO/ trivial
How does a bend like this happen? I bought a fairly expensive bicycle a year ago, and just today it stopped working, all of a sudden, the pedals would kind of lock - the chain would fall off, and when I took a closer look, the middle of the three rings was totally wavy, and would constantly throw the chain off itself - for then to catch it back up again, with every turn of the pedal, untill it got jammed, and locked everything in place again (to unjam, i could simply pedal backwards, but it'd re-jam again almost instantly)
I really expected a pricey bicycle to be able to handle mostly straight roads, without the components bending all over the place...
IDK. I bout the bike like this. Maybe in shipping from Italy. Maybe someone hit something.
I just bought my first mtb used and of course the outer one is a little bent. Nothing horrible but enough the chain gets a little skip. Can you not remove those screws on the outer ring and pull just the outer one off and just tap it straight?
You can try, but I think this method might be a little more accurate since you can spin the cranks and see deviation.
Have you seen my bent chainrings? Take a look... Doubt I can fix them
thank you, now i know you are making these movies so that people will destroy their bikes
Hi rj I have a problem with my bicycle rear derailleur it's not adjusting I tried alot to adjust it but it doesn't work I watched about 21 CZcams videos and I tryed about 12 times to adjust my bicycle rear derailleur but it isn't working I checked every thing and the freewheel is good the derailleur is good the chain is in the good condition I don't know what is the problem my freewheel and the derailleur is from shimano sis six speed freewheel and I spend about one week to adjust it but it doesn't work but in my country there is no pro bike shop to fix it I don't know what to do help rj
+Ahmad Suliman I answered on another comment.
جيبه اني اسويلكيا
Cheaper and less time using a new chainring.
Nice camera angle when using the screwdriver...
Thanks man i bend mine for stupid ideas sub and like
You really need to be careful doing this. I've bent a few and they actually came out nice. I'd just swap the chainring. It's really hard to get it straight.
Bought a brand new Specialized Rockhopper and had a bent chainwheel straightaway. Crappy chinese production.
Yo wat if the sprocket is bent the other way...?
Gamer Boy
Yo you would bend it in the other direction. Smh
Man, wish this was my issue. Mine has 3 gears and is new and the entire ring is bent.
Good thing I got the dealer to give me 50% off, because the cost to get my bike road ready is ridiculous.
Don’t buy a Chinese piece of crap, even if it’s all that is available.
All I do is use a hammer