The Schwalbe Racing Ralph Evo Mountain Bike Folding Tyre is The perfect racer. Faced with the extreme challenges of today's XC tracks, Schwalbe has completely revised Racing Ralph. The result is a very fast and versatile XC profle, specially developed for the rear wheel. Profile design: Numerous grip edges in the tread center for super traction and excellent acceleration. Good rolling properties and extremely quiet. Tubeless Easy Version: with ADDIX Speed (red) for speed, stability and durability.