PARK TOOL CC-4.2 Chain Checker Tool recumbant BOA® Fit System with L6

BOA® Fit System with L6 dial provides easy on the bike adjustability

Fast rolling tread

spring lock

A spring-loaded

age 5 and under

PARK TOOL CC-4.2 Chain Checker Tool recumbant BOA® Fit System with L6A 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