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. Tubeless Easy Version: with ADDIX Speed (red) for speed, stability and durability. --------------------------------------------------------------------------- ADDIX COMPOUND Push yourself to your limits and demand the most from your tyre. When the pressure is on, it shows its true colours: more grip, more speed, more mileage. Experience a different dimension. ADDIX - the new compound for Schwalbe. For all information, please visit; https://prf.hn/click/camref:1100l3S37e/creativeref:1011l140395/destination:https%3A%2F%2Fwww.schwalbetires.com%2Faddix-compound%2F Formula & Raw Materials Every rubber compound is made up of natural and synthetic rubbers - along with many other solid and liquid ingredients. Carbon black, silica, silanes, oils, sulphur anti-oxidants to name just a few... The quality of all these raw materials determines whether a tyre will be outstanding or just mediocre. There are countless options for selecting, combining and measuring them, so a good formula requires highly specialised expertise, high-quality raw materials and extrensive testing - it goes without saying that the final recipe is top secret.