Best selling 2PCS G3 MTB mountain bike disc brake rotor hydraulic disc brakes bike use 160MM for AVID BB5 and BB7 Fanatical G3: 160 MM 160 millimeters (6 inches), including stainless steel brake disc screws Disk request to friction, heat resistance and corrosion resistance is higher than the decrease in the flatness requirement of the general requirements of the disc. Use:Mountain Bikes,Road Bicycles quantity:2pcs