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Old 02-22-08, 07:49 AM   #1
wolfpack 
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more chainring/chain/cassette questions

for those who read/responded to my thread about the chain coming off the big ring while trying to do powerstarts (50/12-14) - another question.

i looked at the 50T (sram rival) chainring yesterday with a friend and he thought that it was worn in several areas. short nubby teeth and a couple of teeth that looked like metal had been shaved off and a bit rough in places. i understand that there are to be shorter teeth on the chainring to facilitate shifting, but maybe these shorter ones have been worn down more than they should be. there are pictures in the other thread.

my question now...the cassette i have on the bike has probably somewhere between 1500-2000mi on it, maybe a tad more, not sure cause i'm at work and my log is at home. i'm on the second chain with this cassette and this current chain has around 950mi on it. maybe i need to replace the cassette/chain and see if the chain still comes off of the big ring under heavy load/power?

another thing...i'm not a skinny/light person. although i have lost 32# in the last year, i still need to lose another 15-20 to get at some respectable weight. i'm thinking that heavier riders will put more wear on the drivetrain than someone who is lighter. so, maybe i just need to replace stuff a little more often than someone who weighs in around 140#.
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Old 02-22-08, 09:06 AM   #2
OldRed
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Replace

It is my understanding that when chain rings are replaced, the casette should be replaced, and the chain. If one of the items is worn it will make new parts wear when run with it.

Chains kept clean will last longer, but they are cheep enough to replace often. A clean chain, in good condition, should help the chain rings and cassette last longer. I replace the chain at least once a year.

Unless you ride in grit and dirt a lot, the components should last a season or two. I tip the scale on the plus side of 200 lbs and don't have trouble with the chain coming off of the rings. Of course alignment is a consideration, but if your components are not aligned there should be other issues.
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