Park Tool Chain Checker - CC-3.2 Groupsets 100mm extension bar included

100mm extension bar included

3" x 3" x 2

Open front makes it easy

Formulated with high viscosity synthetic oils

Park Tool Chain Checker - CC-3.2 Groupsets 100mm extension bar includedA worn bicycle chain can cause poor shifting and in time can even cause excessive wear to the derailleur and rear cogs, causing a much more expensive problem. That's why bike component manufacturers recommend chain replacement at regular wear intervals. The Park Tool CC 3. 2 is a go no go gauge designed to accurately indicate when a chain reaches 0. 5% and 0. 75% wear (or "stretch"), the points at which most chain manufacturers suggest replacement.