FSA Chain ring help - broken teeth?

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2007-12-19 7:49 AM

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Expert
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Subject: FSA Chain ring help - broken teeth?

Bike is a 2007 felt B2 

OK so I need some help, last night I was cleaning the bike up after riding it on the trainer and it looks like several teeth on my big ring have the tips broken off and the outer ring looks like its wearing really bad already.  I have less than 200 miles on the bike, most of them are trainer miles. 

My question is, can someone please take a look at their chain ring and tell me if are some of the teeth tips supposed to be lower than the others or do I have a serious problem.  I am planning on calling the bike shop later, but this is freakin me out, the bike isn't that old.

2007-12-19 7:56 AM
in reply to: #1109244

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Subject: RE: FSA Chain ring help - broken teeth?

I had this same problem this summer on my Felt not with worn down teeth, but I had a bunch of broken teeth. But, with mine, it was because I had crashed a few times. I am not the most graceful rider out there

It caused me to lose power in my big chain ring and caused me problems shifting.

But, it was an easy fix at the bike shop and I got a used but in good condition gear for like $15.

2007-12-19 8:14 AM
in reply to: #1109244

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Champion
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Subject: RE: FSA Chain ring help - broken teeth?
My shop would likely fix this as a warrantee issue. I have a good relationship with them and consider myself an "insider" there, so that might be why I feel they would.

Disappointing about the chainrings; I have 2 FSA cranksets with OEM chainrings and haven't had this happen. The paint has rubbed off one cranksarm from shoe rubbing, but NBD.

Have you taken them off and on the spiders? Wondering if incorrect torque of the bolts caused them to have non-linear stresses or the like? You'd think the chain would snap before teeth?
2007-12-19 8:43 AM
in reply to: #1109244

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Subject: RE: FSA Chain ring help - broken teeth?
I doubt there is anything wrong with your chainrings.  They are designed that way to improve shifting performance.
2007-12-19 9:22 AM
in reply to: #1109362

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Subject: RE: FSA Chain ring help - broken teeth?
JohnnyKay - 2007-12-19 7:43 AM

I doubt there is anything wrong with your chainrings.  They are designed that way to improve shifting performance.


Agreed. There are several teeth on the big ring that are cut differently to speed chain pick-up when shifting to the large ring. You might also notice some round, rivet-looking things near the shorter teeth - they help to grab the chain and pull it up to the big ring, too.

Unless the tips of the teeth are sharp and rough, you didn't break them.
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