The Mavic Crossmax XL R 29in Boost Wheelset is one of our favorites for shredding singletrack. Featuring a lightweight carbon fiber layup and Mavic's exceptional Infinity hub, the Mavic Crossmax XL R 29in Boost Wheelset offers premium trail and enduro performance. A 30mm internal width allows us to run tires up to 2. 5-inches wide, and the ultra-lightweight construction has the wheelset weighing just over 3. 5 pounds.