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Is it time for a new chain & cassette?(5 posts)

Is it time for a new chain & cassette?bike n veg
Jul 24, 2002 6:49 AM
Since we're on this topic, when is it time to replace the chain and/or cassette?

I've put a lot of mileage on my '99 Bianchi Eros and now the chain skips when it's on the smallest rear cog. I keep the chain and cogs clean. Has the time come to replace the chain and cassette? Is it possible to "upgrade" from my existing components?
re: Is it time for a new chain & cassette?DINOSAUR
Jul 24, 2002 7:05 AM
On the "average" you should replace your chain about every 2K, your cassette about every 5K (or every other time you replace your chain). Keeping your driveline clean will prolong the life of your components. Should be no problem upgrading, your group is only 4 years old.
you'll need both for sureColnagoFE
Jul 24, 2002 7:43 AM
if you'd have changed your chain sooner you might have gotten away with just a chain replacement, but i'm sure the cassette is way worn now.
Jul 24, 2002 8:29 AM
How many miles is a lot? Depending on the quality of the chain and the maintenance, it could last 1000 miles or 5000 miles.

The chain should be changed when a 12 inch length has increased to 12-1/16 inches (measured center to center on the pins).

It would be unusual to wear out only the smallest cog. Most people use the third, fourth or fifth cogs a lot more. One of these is usually the first to go. There are probably a lot of junked cassettes out there with perfectly fine first cogs.
Probable causeKerry
Jul 24, 2002 4:44 PM
Measure your chain. No special tools required. Likely situation is that the chain has elongated a lot and so can't keep its grip on the small cog. Unless you've been riding the small cog a lot (why on earth would this be?) it isn't likely worn. You could replace only the worn cogs, but cog prices don't make this reasonable if you need to replace more than 3. You can put higher grade stuff on and you will get a slight improvement in shifting and longer part life. YMMV