Durable all weather urban tread. Features Schwalbe's 5mm SmartGuard belt. EBIKE50 - tires with this designation in the Features section are approved and tested for E-bikes up to 50 km/h. SGRD - Smartguard equipped tires feature a 5mm breaker belt made from special Indian and partially recycled rubber. REF - Reflective sidewall striping or hotpatch to aid in low light visibility. Please note that EBike rated tires also can be used with non-Ebikes and are generally more durable than standard tires.