Forged aluminum shell and freehub with 15mm axle diameter. Features DT-Swiss patented, star-ratchet mechanism. Contact free flange seals with stainless steel cartridge bearings. Center Lock 35mm splined disc rotor mount, XTR/XT compatible. 8/9sp rear, 136g/130g/258g: Choose black with red sticker or white edition. Features: Stainless steel ball bearings Non-contact mechanically sealed endcaps Center Lock hubs have rotor mounting systems licensed by Shimano, Inc., and include threaded centerlock cover HU2062 includes RWS thru bolt and fits standard dropouts