Park Tool CC-4.2 Chain Checker Tool Derailleurs 5 in 10 in 11

5 in     10 in     11

These crampons are US Patented and built to last - covered by a two year limited warranty

Proven symmetrical design

PFC/PFAS-free DWR•ACCENT- bluesign approved 500D recycled polyester packcloth

Easily adjust hood without unzipping using low-profile internal cordlock access

Park Tool CC-4.2 Chain Checker Tool Derailleurs 5 in 10 in 11A worn bicycle chain can cause poor shifting and expensive drivetrain damage. The Park Tool CC 4. 2 Chain Checker is a drop in gauge that measures chain wear accurately. It contacts the chain in three places, eliminating guesswork. Compatible with 5 to 13 speed and single speed chains, it indicates wear at 0. 5%, 0. 75%, and 1. 0%, matching manufacturer replacement recommendations. Measures bicycle chain wear accurately, preventing expensive