Profile Design T3 Carbon Aerobar. If you're serious about pedaling fast against the clock be it your local time trial or a bike leg of your favorite triathlon then the Profile Design T3 Carbon Aerobar is an essential element of your wind cheating capacity. This clip on aerobar is part of Profile Designs' superb T Carbon 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 carbon fiber and can be adjusted in length from 200mm to 300mm. Furthermore, there's an additional world of adjustability to fine tune one's aero position courtesy of the J4 brackets and F 35a aluminum armrests. And for maximum versatility, the aerobar's clamp is compatible with both 31.8mm and 26.0mm bars.