Mavic's Crossmax SL Pro has pushed the limit again, shaving weight where it really matters thanks to the new exclusive ISM 4D rim. Whether racing or trail riding, Crossmax SL makes for en even more dynamic ride! Benefits: The lowest inertia: new ISM 4D rim. Stiff: 19 mm rim, thru-axle compatible, Fore, Zicral. Efficient energy transfer: ITS-4, Isopulse, UST. Ease of use: ready to ride UST standard. Mavic race proven technologies: UST, SUP, Fore, ITS-4, QRM+ For World Cup racing and fast trail riding. Hub compatibility: 9/15 up front and 9/12x135/142 rear.