Made for mountain bike and trekking/training bike tires, but at home on a CX bike of course, the X-Blade’s unique design offers optimized dirt protection. Offers simple, quick-release fastening to the seat post. Spray protection zone is wider for mountain bike tires and also longer for trekking/training tires. Made from dual-compound plastics which not only reduce vibration, but offer flexibiity to reduce problems with tire contact. X-Blade has two adjustment points which provide a custom fit and protection. Fits 28 and 29 Tires as well as 700c CX tires.