COLNAGO EGRV GRX ELECTRIC DISC ADVENTURE BIKE 2020The eGRV GRX Electric Disc Adventure Bike from Colnago utilises Ebikemotion’s 250W hub-based motor to provide assistance up to a maximum speed of 25kph. By putting the motor in the rear hub and not the frame, there are no drivetrain losses and the frame remains free from any unsightly bulges. Shiman..