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Discussion Starter · #1 ·
Question: I just got a used (like new) M760 Crankset and noticed the teeth on the cogs are not uniform in size/shape. They do not look worn as they are still completely black to the tips, but they just seem to vary is size and the grooves are slightly different from tooth to tooth. Is that normal? If so, what is the purpose?

Thanks for any info.
 

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Former Bike Wrench
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Normal

Is it normal...Yes...Shimano's tend to be the most pronounce (and hence generally the best shifting...though Race Face rings are pretty close).

Why...to improve shifting performance (look at your rear cassette, the teeth are shaped on that as well). Every tooth is engineered for its specific location in the pedal stroke location to improve shifting no matter where in the rotation you attempt to shift. Seriously!!! Shimano spends copious amounts of time studying this stuff.
:thumbsup:
 
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