Profile Design ZBS TT Aerobar. If long, low, and pro defines 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 since the aerobars are constructed from forged 6061 T6 aluminum throughout, the set up is both lightweight and durable. Mount the ZBS TT aerobar onto a road bar or bullhorn bar and get ready to blaze through your next ride against the clock.