Ergonomic Legacy II Aerobars feature extensions that provide a variety of hand positioning, and width and rotational armrests with a high stack to achieve a relaxed ride position. Ideal for riders that need extra positions for Centuries. - Injected Venturi Armrest and ZB Bracket - Forged 6061-T6 construction with armrest made of injected nylon and glass fiber - Fixed extension adjustment - Extension angle 44 degrees with 58mm rise - Fits both 26.0 and 31.8mm basebars, shims included