Park Tool CC-3.2 Chain Checker RGroup_1A8B5DDD632ADDEF35AEC1FF5AE2B4C8D6857138 The Box Four drivetrain ensures

The Box Four drivetrain ensures smooth shifting

or rubber parts

With a 175mm crank arm length and Boost spacing

Ride with minimal chain slap by using a Chainstay Protector

and it’s even disc brake rotor and pad friendly

Park Tool CC-3.2 Chain Checker RGroup_1A8B5DDD632ADDEF35AEC1FF5AE2B4C8D6857138 The Box Four drivetrain ensuresA worn bicycle chain can cause poor shifting and, over time, excessive wear to the derailleur and rear cogs. Regular replacement at wear thresholds helps prevent costly drivetrain damage. The Park Tool CC 3. 2 Chain Checker is a go no go gauge that accurately indicates when a chain reaches 0. 5% and 0. 75% wear, the points at which most manufacturers recommend replacing the chain. Its long, precise, and features permanent measurement markings to