Staggered center knobs in groups of 1 2 and 3 paired with angled shoulders and large aggressive corner knobs. EBIKE25 - has achieved a passing rating for use with E-Bikes up to 25kph. Twin Skin - An additional rubber coating on the side protects against cuts and allows for uniform coloring. ADX – Addix compound found on the Performance Line made to serve as an all-around well balanced compound for all uses. *Please note that EBike rated tires also can be used with non-Ebikes and are generally more durable than standard tires