Mavic Crossmax SL 27.5 Supermax Mountain Wheelset. There's nothing like a good wheel upgrade to convert your mountain bike into a rocket ship and if you happen to have a Lefty Supermax fork installed then the Mavic Crossmax SL 27.5 Supermax wheelset is a perfect choice. These wheels check in at a mere 1470 gramspair and with the weight so low you know the responsiveness and acceleration are out of this world. Strong Maxtal aluminum alloy rims with ISM 4D machining help lighten the load by up to 50g for faster climbing, feature the lowest inertia for instant acceleration, and a smooth, aerodynamic rim shape to reduce drag. Bladed Zicral crossed spokes up front provide stiffness and vertical compliance and Isopulse spokes in back increase rigidity under heavy loads for better energy transmission. Lightweight carbonaluminum hubs are loaded with high quality, externally adjustable QRM bearings for super smooth performance. And to maximize versatility, the Crossmax SLs are also UST compatible to take full advantage of going tubeless.