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Chain wear measuring(4 posts)

Chain wear measuringbiker
Jan 6, 2002 10:08 AM
I know the rule of thumb is to measure the chain links 12" and if over about 1/16" it should probably be replaced.
What I have not seen clarified using this method - where to measure (lower or upper) ?

My conclusion is to put chain on large chain ring and large freewheel and put tension on chain by applying pressure to pedal and then measure on upper part of chain.
doubt it matters...C-40
Jan 6, 2002 2:12 PM
Your method is fine, but if you apply pedal pressure, it shouldn't matter what cog combo you choose. The derailleur spring pressure has no effect on the upper portion of the chain. Using the straightest combo makes more sense to me.

I seriously doubt that you can see any difference between the upper and lower sections.

I check mine with the chain off the bike. Stretch the chain tightly while laid out on the workbench and measure over 4 feet for greater accuaracy.

I rarely bother checking a high quality campy (10) chain. I've never come close to the allowable maximum stretch, even after 4000 miles of use. I change mine every year anyway, just to be safe. It's cheap insurance against failure.
doubt it matters...JimP
Jan 7, 2002 11:54 AM
Right on! A new chain every spring is cheap insurance. I had a friend of mine break a chain in a triathlon - you can't win if you don't finish. If you do measure any chain wear, you probably have trashed at least one cog and will have to replace that too.
Park Chain Checker CC-2Jerry near St. Louis
Jan 8, 2002 2:13 PM
Get a tool like the Park Chain Checker CC-2 for under $20. You put a gentle amount of pressure on the chain with it.

It's cheap insurance for an expensive drivetrain. Plus you can check all of your friends' chains.