The perfect racer. Faced with the extreme challenges of today's CX tracks, we have completely revised Racing Ralph. The result is a very fast and versatile XC profile, specially developed for the rear wheel. Profile Design: Numerous grip edges in the tread centre for super traction and excellent acceleration. Good rolling properties and extremely quiet.   ADDIX Performance ADDIX is also available in the Performance version. Very durable, very versatile. Like Speedgrip it is a universal compound only these tires are not as light and fast as tires from the Evolution Line..   Specification: Size: 29", 27.5". Type: Folding. Compound: Addix Performance. Execution: Performance, TL-Easy. Skin: Twin.