Profile Design T1 Aluminum Aerobar. The Profile Design T1 Aluminum Aerobar provides the means to optimize your wind cheating capacity in time trials or bike legs of triathlons all the while maintaining a comfortable position. This clip on aerobar is part of Profile Designs' superb T series, and its double bend ski bend shape minimizes hand and wrist discomfort by placing your hands in a more neutral position compared to flatter, aggressive bend styles. The extension itself is construction of aluminum and can be adjusted in length from 155mm to 290mm. 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.