Built for Olympic athletes the new Crossmax SL Ultimate is the most dynamic XC wheelset ever created by Mavic. Lighter stiffer faster - it's all about going for gold. Fly up climbs and accelerate faster New carbon Adaptive layup technology shaves 70g per rim. a 25mm wide rim weighs only 340g. Stiff and smooth ride quality Special carbon rim layup for superior rim stiffness and added control on descent. Double-butted two-cross spoke pattern for enhanced vertical compliance. Efficient power transfer New lighter Infinity hub design paired with 24 straight-pull spokes for improved stiffness and better balanced spoke tension. Weight Pair: 1395g Rear: 760g Front: 635g Understanding the different Mavic freehub body acronyms: HG or M11 – Shimano HG Road 11/12x other speeds with spacer MS - Shimano Microspline XD - SRAM XD XD-R - SRAM XD-R ED11 - Campagnolo 9/12x N3W - Campagnolo 13x