Lightweight clip-on aerobars constructed from aluminum. Superb set of clip-on aerobars that attach to handlebars with a diameter of 31.8mm. Designed for time-trial and triathlon riders, they’ll ease you into an aerodynamic but sustainable position where you can still generate maximum power. 60mm of adjustability upfront suits time-triallist and triathletes looking for a greater stretch in their all-out efforts, and triathletes seeking a more conservative stretch to conserve energy for the run 30mm of elbow pad adjustability suits riders a more flexible riding position. 20mm, 40mm, 60mm spacers are available in which riders can optimize the stack height seeking for the most aerodynamics with the best ergonomics. Weighs just 450g (Zero stack).