Staggered center knobs in groups of 1, 2 and 3 paired with angled shoulders and large aggressive corner knobs Staggered center knobs in groups of 1, 2 and 3 paired with angled shoulders and large aggressive corner knobs SPDGRP - SpeedGrip - Addix SpeedGrip compound is Schwalbe`s all around performace upgrade compound well versed on all terrain and conditions EBIKE25 - has achieved a passing rating for use with E-Bikes up to 25kph and is ECE-R75 approved *Please note that EBike rated tires also can be used with non-Ebikes and are generally more durable than standard tires