Profile Design ZBS TT Aerobars. If long, low, and pro define your time trial position then the Profile Design ZBS TT Aerobar is the perfect clip on for you. The ZBS brackets deliver a lower arm position while the F 19 adjustable anatomic armrests ensure a perfect, dialed in fit to best cheat the wind. It's not enough to be aero, though, but don't worry as the forged 6061 T6 aluminum throughout is both lightweight and durable so you know they're built to last as well. Mount these bad boys on a road bar or bullhorn bar and get ready to blaze through your next ride against the clock.