Mavic Crossmax SLR Disc Wheels 2014 - 650b (27.5") ISM3D: Inter Spoke Milling 3 Dimension. ISM3D pushes the envelope of ISM one step further by not only machining the lower bridge of the rim between each spoke holes, but also its sidewalls UST: Universal Standard for Tubeless. A better grip for tighter control. no more tube, no more rim tape: sounds to good to be true. The UST concept eliminates heat, friction and guarantees a smoother ride Rim resistance: Maxtal alloy, Fore drilling, SUP welding ITS-4: Instant Transfer System 4. 4 pawls, working 2 by 2 provide a very fast engagement. 2 large cartridge bearings ensure the smoothest rotation of the hub body: - engagement reduced by 60%, ensuring instant energy transmission. - full compatibility with all retention systems - 20g lighter thanks to a lightweight freewheel body in alloy. 142mm x 12mm Thru conversion available for rear wheel