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Mavic Allroad Elite Road+ Aluminum Tubeless 650b Front Wheel model-cortona Since the M630s have theRoad riding is evolving in adventurous new ways, and this purpose built wheel system is at the forefront of this progression. A combination of super wide rims (25mm internal) and a smaller 650B rim diameter allows you to run large 45 to 50mm tires that absorb road shocks and vibrations. But even with the added 5cm of "tire travel," the smaller rim diameter means you'll retain the agile handling that makes a road bike a road bike. No compromises here.