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Chain Stretch - How much is too much?(5 posts)

Chain Stretch - How much is too much?B2
Aug 29, 2002 3:47 PM
I just measured my chain. I get about 12-1/32". My understanding is that 12" even is what a new chain is. So is 1/32" too much??

Simple rulesKerry
Aug 29, 2002 5:34 PM
For high performance systems (9/10 speed) the standard rule is replace the chain when you get to 0.5% elongation. This equals 1/16" per 12". On older systems (7 speed) you can get away with 1/8" per 12". Some people replace chains sooner, thinking they can save their cassettes. My math says that this is not productive, given the costs of chains and cassettes.
Thanks KerryB2
Aug 29, 2002 5:58 PM
My main concern was the premature wear on the cassette. I'm running Campy 10 speed and a Wipperman chain. I now have a little more than 1,000 miles on the chain and thought I'd better check based on others comments regarding the Wipperman chain. I'll continue to monitor.

another way to check; same resultscory
Aug 30, 2002 7:28 AM
Grant Petersen at Rivendell says to put the chain on the big ring and pick it up twixt thumb and forefinger at 3 o'clock (as you face the chainring, not a.m.). If you can pull enough slack to expose a tooth, it's time to replace.
go to your shop...seyboro
Aug 30, 2002 5:49 PM
...or you just get the chainwearmeasuringthingamajiggie from Park Tool yourself. Absolutely idiot proof (...and you can charge all your buddies a dollar for checking theirs, money back in no time!!)