and however hard you push

weight (rear/29) 590g

Number of gears: 12 speeds

Pin Quantity: 10 replaceable pins on each side

Topeak Chain Wear Indicator and Hook Tool Exclusive and however hard you pushEnsure your chain and drivetrain are in good shape! The Topeak Wear Indicator easily tells you whether you need to replace your chain. It also features a hook tool to help install new links. Chain Wear Guide User Instructions: 1) Put " STEP 1 " inside a chain space and fully engage a roller. 2) PRESS " STEP 2 " on a roller. If "STEP 2" can't engage in the roller your chain is good to go. If "STEP 2" can engage in the roller its time for a new chain.