Mavic 2015 Crossmax 29 SL Mountain Bicycle Wheelset The lowest inertia: new ISM 4D rim Ease of use: ready to ride UST standard Stiff: 19 mm rim, thru-axle compatible, Fore, Zicral Weight: Pair 29": 1520 grams Efficient energy transfer: ITS-4, Isopulse, UST