Specifically developed for compatibility with Gravel, Adventure, Cyclocross and Road bikes with tires exceeding 28mm. Speedrocker XL fits up to 40-52mm while the standard model fits 28-42mm Offers incredible stability over the roughest tracks while also providing optimum protection in all weather Features a dualheight front spoiler, which deflects water and mud onto the wheel and downwards, away from the rider’s face Rear mud guard utilizes an innovative telescopic extension for greater coverage near the seat tube Held firmly in place with a rubber fastening system to suit a multitude of frame designs, including integrated recesses for brake or gear cables as required