A new twist on a proven tire the Marathon GT features a wide smooth center section with a micro-textured shoulder and DualGuard protection for the tread and sidewall. EBIKE50 - has achieved a passing rating for use with E-Bikes up to 50kph and is ECE-R75 approved. REF - Reflective sidewall striping or hotpatch to aid in low light visibility. Twin Skin - An additional rubber coating on the side protects against cuts and allows for uniform coloring. *Please note that EBike rated tires also can be used with non-Ebikes and are generally more durable than standard tires