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General Category >> Technical >> Front chainring wear? Replace?
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Message started by FlyingLaZBoy on Apr 14^th, 2008, 7:13pm

Title: Front chainring wear? Replace?
Post by FlyingLaZBoy on Apr 14^th, 2008, 7:13pm

Having just put a 26/36/46 with 165 cranks onto Terrie's Birthday SXP (shhhh! 8-) ), I now have an "extra" 30/42/52, complete with 175mm cranks. This got me thinking about gear tooth wear, and the fact that I've replaced two rear XT cassettes on MY SXP over the last couple of years due to chain wear resulting in gears slipping -- but replacing the front triple was never suggested by the LBS.

Given 12,000+ miles on my original 30/42/52, should I swap out Charlie's old one (that only had ~4,000 miles on it), and pitch the original, or is a front chainring good for many more miles? And if so, why isn't wear on the front rings as significant as on the back -- more teeth to engage?

Hep me, hep me! :-/

Title: Re: Front chainring wear? Replace?
Post by Opus the Poet on Apr 14^th, 2008, 9:22pm

You got it, the greater number of teeth on a chainring reduces the wear, until the chain gets really worn. Then it all goes out the window and as little as 500 miles with a badly worn chain can ruin a chainring.