The Shimano SM-RT97ss Disc Rotor will fit all centerlock hubs except Saint M800 and M805. Shimano"s RT97ss XTR level centerlock rotor is the real deal. With 4 long alloy arms connected to a 140mm diameter steel brake track, Shimano has designed an XC race specific rotor that will go the distance. The two piece construction makes the rotor stiffer resulting in a truer rotor that offers quieter operation in crosswinds. Additionally, this design offers better heat dissipation that will keep your brakes consistent at the bottom of long descents. Brand: Shimano Model: XTR SM-RT97ss Centerlock Size: 140 mm Color: Silver/Blue Material: Steel Included in Box: Rotor x 1, Centerlock Weight: 110 grams Specifications: Steel & Alloy Warranty: 1 Year Product"s Warranty Package: New in OEM Package, Bubble Wrap, Ship in Box