Shimano SM-RT54-SI Disc Brake Rotor - 160mm, Center Lock, For Resin Pads Only, Internal Spline LockringThe Shimano SM RT54 disc brake rotors provide exceptional stopping power in all riding conditions. Shimano's Center Lock mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design. For use with resin pads only Center Lock lockring design offers fast and easy installation Product Specifics Rotor Size (mm): 160 Rotor Type: Two Piece Pad Compatibility: Resin Pads Only Hub Disc Compatibility: Center