The bars 70mm reach the horizontal distance from the bars stem clamp area to center of the brake perch is the shortest of zipps new service course lineup its 128mm drop vertical distance from bars stem clamp area to bottom of drops help puts the rider low and in control without compromising comfort whether its a rider with a shorter torso or a bigger rider getting aero by pairing this bar with a long stem this bar helps put just about any cyclists into his or her optimal position th