Ultra-strong agile and lightweight this Crosstrail sl carbon combines the best of mavic's technologies making it your best companion to tackle any trail. Ultra Robustr Its new lower profile and UD2 carbon construction make it the strongest carbon trail wheel in its segment The lightest e-bike wheel The use of carbon fibre gives it a record weight making it the lightest in its segment Improved responsiveness The reduced inertia of the rim combined with INFINITY hub technology means instant acceleration Weight Pair: 1690g Rear: 935g Front: 745g 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