chainring tooth is smashed. How did it happen?

BeerCan · Jun 14, 2020

I have only 50 miles on this bike. I started cleaning the drive train today and I noticed this chain ring tooth is deformed. Looks like it hit something square on but I don't see how that could have happened.

Should I just file it and move on? Any ideas on how I could of done this, I can't think of an event that could have caused it.

d-ron · Jun 14, 2020

Big rock or curb? Yes, I would just file it down and go for a test ride. My guess is it will work just fine.

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Aglo · Jun 14, 2020

Probably some kind of rock strike. I have one of those from time to time. If it's catching the chain take a file to it, if not just keep riding.

davez26 · Jun 14, 2020

Lucky rock strike, or hell maybe even something hit it prior to sale in assembly.
No effect on performance.
Make up an awesome story about how you were road gapping and the suspension compressed so much you hit a ____.
Ride it like you stole it and soon it will have buddies on other parts of the bike.

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LCW · Jun 15, 2020

That’s why I always run bashguards on my bikes.

RS VR6 · Jun 15, 2020

Unless the tooth protrudes like a Garbaruk ring...how would it hit a rock?

Trinimon · Jun 15, 2020

OP, did you check the full length of chain for any damage to any of the links? Hard to bash a tooth like that without some kind of damage to a link as the teeth doesn't protrude past the height of the chain.

That said, I add a bash guard to all my trail bikes.

92gli · Jun 15, 2020

RS VR6 said:
Unless the tooth protrudes like a Garbaruk ring...how would it hit a rock?

I've had rocks fly into my chainring several times. Usually no problem but one time a chain roller broke in half.

Aglo · Jun 15, 2020

The teeth are slightly taller than the middle of the chain link, so it's possible to smash the tip of the tooth without damaging the chain.

Harold · Jun 15, 2020

LCW said:
That's why I always run bashguards on my bikes.

yep

92gli said:
I've had rocks fly into my chainring several times. Usually no problem but one time a chain roller broke in half.

quite a few descents I ride have loose rocks all over them. Haul @zz through those at speed, and rocks get kicked up all over the place. Some hit the bike.

Bash guards and shelter tape for me, even on my hardtail. Doesn't protect everything, but it covers enough exposed bits that the risk of actually damaging something functionally is much reduced.

sturge · Jun 15, 2020

file and ride...it's only new once!

chainring tooth is smashed. How did it happen?

BeerCan

d-ron

Aglo

davez26

LCW

RS VR6

Trinimon

92gli

Aglo

Harold

sturge

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