HTZ i35 wheels are optimized for your e-assist MTB trail bike; ready for more distance, more laps, more climbs and more descents. With all those “mores” also comes more weight, continually bashing on the components of an e-bike. In order to overcome the increased forces induced by the technological progression of modern e-bikes, WTB designed the HTZ wheels to be reliable, sturdy and safe; keep riders, rolling.