Profile Design T3 Aluminum Aerobar. Profile Designs have put their considerable knowledge of aerodynamics and ergonomics into the design of the T3 Aluminum Aerobar. Line up for your next time trial or triathlon bike leg with confidence that you'll be fully equipped to pedal fast against the clock. This clip on aerobar is part of Profile Designs' superb T series, and features the most neutral wrist position of any aerobars in the line up. The unique, ergonomic shape allows for the widest variety of hand positions, making it very easy to dial in for individualized comfort. The extension itself is construction of aluminum and can be adjusted in length from 175mm to 270mm. Furthermore, there's an additional world of adjustability to fine tune one's aero position courtesy of the J2 brackets and F 19a aluminum armrests. And for maximum versatility, the aerobar's clamp is compatible with both 31.8mm and 26.0mm bars.