FastTT’s Triathlon Aero Bar is Designed for Speed, Comfort, and StabilityI’m not a bike fitter, or a wind tunnel expert. The Fast TT 2.0 carbon aero bars are like that, just in black and from New Zealand, not Italy. The aero bars come in 4 t-shirt sizes: small, medium, large & XL. Adapter Plate + Aero Bar Mounting Bracket. I’ll get the pleasure of racing the Fast TT aero bars in one more 70.3 in September to close out the season.