Park Tool CC-2 Chain Checker in Blue

An accurate way to check for wear of roller and pin on chains Features 1% of wear is enough to affect chainrings and sprockets, and allow shifting performance to deteriorate Just insert the Chain Checker's pins into two links, press the swing arm gauge, and then check the gauge window for an accurate reading Reads wear from 0.25% to 1% 10-speed compatible Made in the USA and covered by Park Tool's legendary limited lifetime warranty