The Mavic Crossmax Elite WTS 29-inch Boost XD Wheelset was engineered to be the lightest Aluminum rim! It is engineered with ISM 4D (Inter Spoke Milling) technology, which machines the rim between each spoke hole to minimize weight without compromising strength. The rim is wider (22mm internal) and features the UST tubeless system for improved traction, reduced risk of punctures and easier tire mounting. QRM hubs deliver smooth, long-lasting performance, and the fast-engaging ITS-4 freehub enhances the quick and dynamic feel. On the scales, the Crossmax Elite leads its category:1715g in 29.