Mavic Ksyrium SLS Road Bike Wheelset Mavic delivers the WTS (Wheel Tire System) to performance cyclists Maxtal aluminum alloy rims offer a higher strength-to-weight ratio than conventional 6106 alloy SUP welded rims increase the rim joint strength, provide superior wheel balance and eliminate vibration when braking Inter Spoke Milling 3 Dimensions (ISM 3D) pushes the envelope of ISM one step further by not only machining the lower bridge of the rim between each spoke hole, but also its sidewalls, for a lighter weight, faster climbing and quicker acceleration