It should go without saying that Hed’s aerobars are extremely aerodynamic, but we’ll just lay it out: they are, even by themselves. But, position and power are where races are won or lost. Like fingerprints, no riders have the same optimum TT position, so we offer three base bars, three t extension bars, 3 axis adjustability for armrests, and 2 armrest mounts, plus width and angle micro adjustability. Maybe not quite as many possible positions as there are fingerprints, but pretty damn close. DROP BAR Drop base bar for a lower, more aggressive climb and start position. Molded in ergo grips. Built with integrated carbon brake levers with return spring and interior brake cable routing. Specifications: Weight: 630g 31.8 clamp only Base bar width: center to center 42 cm Carbon intergraded brake levers Riders choice of extensions The base bar drop on the Black Dog drop is 7cm center of stem clamp to top of grip.