Built for Olympic athletes, the new Crossmax SL Ultimate is the most dynamic XC wheelset ever created by Mavic. Lighter, stiffer, faster—it's all about going for gold.At only 1380 grams, this is the wheel that performance-obsessed cross-country racers dream of. Developed with input from top pro racers seeking a competitive advantage at World Cups and Olympics, it features an ultralight full carbon 29 rim (360g) for fast acceleration and climbing without compromising stiffness and durability.Adaptive layup, a specific carbon layup technology enabled us to handcraft these carbon rims with less material between the spokes. The spoke holes are reinforced with strategically positioned carbon layering in a process that minimizes weight without compromising stiffness and strength. A lighter rim means faster acceleration, more efficient climbing, and a more responsive feel on the trail. The external carbon layer features our new UD² construction for a distinctive look and added durability.Extensive field testing with our pro athletes determined that a 25mm inner width was ideal for a quick, precise ride quality and optimized tire grip on fast racetracks. For more technical trails, some preferred a 30mm width for added control, so we created two options. It's your choice, and you can mix the two if you want. You could choose the Crossmax Ultimate 25 for the rear to boost acceleration and efficiency, and the Crossmax Ultimate 30 for the front to add confidence and control on rugged single-track.The carbon rim is laced with 24 straight-pull double butted spokes (same spoke length throughout), two-crossed for maximum power transfer and enhanced vertical compliance. The new lighter Infinity hub design optimizes lateral stiffness, and the spoke lacing maximizes power transfer. Our Instant Drive 360 freewheel with a double ratchet system provides fast engagement and high stiffness to help you accelerate out of corners faster. The rear hub is compatible with Shimano HG9, Micro Spline and SRAM XD driver bodies.The Crossmax SL Ultimate 30 is available with 6-bolt or center lock brake rotors in 29 only and is compatible with a 15x110 front axle and 12x148 rear. It comes with valves, spare spokes and MTB wheel covers.Key benefits:Fly up climbs and accelerate faster:- New carbon Adaptive layup technology shaves 70g per rim. 25mm wide rim weighs only 340g.Stiff and smooth ride quality:- Special carbon rim layup for superior rim stiffness and added control on descent. Double-butted, two-cross spoke pattern for enhanced vertical compliance.Efficient power transfer:- New lighter Infinity hub design paired with 24 straight-pull spokes for improved stiffness and better balanced spoke tension.Specifications:Spokes:- Count: 24 front and rear- Material: steel- Shape: straight pull, flat, double butted- Nipples: aluminum, ABS- Lacing: front and rear crossed 2, contactlessRims:- Drilling: traditional- UST Tubeless Ready- Hookless profile- ETRTO size 29´´: 622x30TSS- Internal width: 30 mm- Adaptive Layup Carbon technology- Material: 100% carbon fiber with UD² external layerHubs:- Instant Drive 360- QRM Auto- Hub available with 6-bolt or center lock (R) brake rotors- Axles: Front 15X110 Boost , Rear 12X148 Boost- Infinity HubIntended use:- Recommended tyre sizes: 50mm to 76mm (2.0´´ to 3.0´´)- ASTM CATEGORY 3 : CROSS COUNTRY- For a longer longevity of the wheel, Mavic recommends that the total weight supported by the wheels doesn´t exceed 150kg, bike includedVersions:- Disc standard : 6 Bolts or Center Lock (R)- Hub width : Boost only (front 110, rear 148)- Freewheel: SRAM XD, Shimano HG9, Shimano Micro-Spline- Compatible Adapters and freewheel bodies- ID360 Shimano HG9 alloy freewheel body ([LV3780100])- ID360 Sram XD freewheel body ([LV3740100])- Boost : Torque Caps ([LV2374400])- ID360 Shimano Micro Spline alloy freewheel body ([LV3990100])Compatibility:- Rear axle: 12x148 Boost thru axle- Front axle: 15x110 Boost thru axleTechnology:Adaptive Layup Carbon technology:- Lighter carbon rim construction for faster acceleration and more efficient climbing.The Ultimate CrossCountry racing application : light and responsive.