Join Date: May 2003
Location: Mountain Brook. AL
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500mi is lousy mileage for either cassette or chain. My experience,
not commuting or off road and not being compulsive about clean
or lube, is that a chain will last 3000-6000mi, a cassette
will last two chains, and chainwheels (the most used ones anyway)
will last 3 chains. Others get better or worse, but 500 is way low.
Riding a very gritty chain in all weather conditions
will certainly accelerate wear and use up the cassette faster.
My longest lived setup was the 8spd front drive on my bent in
which the chain, cassette and
CW all lasted 16,000 mi. Chain elongation was about 3/32
at change out and it was a KMC chain.
Shifting has very little to do with cassette wear, and brifter users
in general shift 3-4x as much as downtube shifters do, with no
difference in wear rates in my experience.