Lighter, stiffer, more precise and easier to maintain - the strengths of the 180 hub are further enhanced with the new Ratchet EXP technology. The ultra-reliable freehub system transfers the highest pedaling loads resulting in direct power transmission. Smooth-running SINC Ceramic bearings bring the decisive advantage with their extremely low rolling resistance. SPECS : Hub Drilling: 28 Skewer Included: No Hub/Brake Compatibility: Rim Brake Cassette Body Type: Shimano/SRAM 11 Speed Road , Shimano/SRAM 8, 9, 10 Speed Spoke Interface: Straight Pull Bearing Type: Sealed Cartridge Rear Axle: 12mm Thru x 142mm