Park Tool
CC-4 Chain Wear Indicator

Wondering When You Should Replace Your Chain? There's A Tool For That

We've all been there — your chain is jumping all over your cassette and falling off after bumps in the road. It's probably time for a new chain, but how do we make sure that it's not just a fickle derailleur?

The Park Tool CC-4 is a drop-in style gauge that measures bicycle chain wear. The laser-cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary.

A worn chain will cause poor shifting as well as accelerate drivetrain wear. The tool works on any 5 to 12-speed derailleur chain (including SRAM® AXS®) and is designed to accurately indicate when a chain reaches .5% and .75% wear, the points at which most chain manufacturers suggest replacement.

Instructions

• Lower the CC-4 onto the chain while keeping the gauge tip above the chain.
• Apply and maintain tension on the chain. Note: It is crucial to maintain pressure on the chain in order to obtain an accurate reading.
• While maintaining tension on the chain, push the chain onto the gauge tip to determine if the chain is worn.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.