SRAM Rotor Centerline 180mm Rounded 6 Bolt frame-wheelset-box-shipping It prevents the chain from

It prevents the chain from hitting and unnecessary movements of the rear derailleur cage

A6061-T6 aluminum body

For 3 / 7 / 8 / 11 speed hubs

Rise: 30mm

Featuring a fine tooth ratchet mechanism with reverse lever and thumb wheel with Nano TorqBits for ease and torque accuracy in tight spots

SRAM Rotor Centerline 180mm Rounded 6 Bolt frame-wheelset-box-shipping It prevents the chain fromThe CenterLine design provides a smooth, consistent, and quiet running braking surface. Rounded edges make for easier wheel installs and are UCI compliant. FEATURES Rounded edges are UCI compliant and allow for easier wheel installs Compatible with both road and mountain bike brakes