Park Tool CC-4.2 Chain Checker Tool Taillights The GP 4-Season is the

The GP 4-Season is the go-to choice for winter training

Compatible with Shimano 9-speed MTB shifters

without sacrificing the mud-shedding performance that makes the Candy series a trail staple

The SRAM RED AXS E1 Front Derailleur is the flagship wireless electronic front derailleur for SRAM's E1 generation RED AXS road drivetrain

Riders who want maximum backup reliability with minimum bulk will find the S-Tubo the smartest option in the Tubolito lineup for CX and gravel riding

Park Tool CC-4.2 Chain Checker Tool Taillights The GP 4-Season is theWhy is the Park Tool CC 4. 2 a better chain checker than a ruler? The Park Tool CC 4. 2 Chain Checker Tool is a laser cut drop in gauge that measures chain wear at three calibrated points simultaneously, giving you a fast, definitive reading on whether your chain needs to be replaced. Compatible with 5 through 13 speed derailleur chains and single speed chains, it reads wear at 0. 5%, 0. 75%, and 1. 0% stretch, which aligns with the replacement