Bicycle Mechanics - Time to play... guess the mileage!

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tobism
07-08-04, 02:07 PM
I was wondering if there's a way to tell if I need to change my cassette and chainrings. I assume if you look closely at the cassette and the teeth were really worn down, then it would be time to get a new one. Is this correct?

Jay_2004
07-08-04, 03:22 PM
if they look sharp...thhen they do also
randya
07-08-04, 04:15 PM
If you change the chain regularly when it's worn / stretched, the gears will last longer (through at least several chain changes). There are several tools on the market for measuring chain wear, I'm familiar with Parks and Rohloff tools for this. Thinning of the gear teeth, or an assymetric appearance to the gear teeth, are both signs of wear. A new chain may skip or run rough on worn cogs and it may stretch sooner if used with worn cogs. If in doubt ask a professional mechanic at your LBS.

John E
07-09-04, 08:29 AM
I just change the chain when it has elongated by 1/2 percent (i.e., 1/16" per 24 half-links, per Sheldon) and change the cogs and/or chain rings when they begin to run roughly or to skip.