Zipp VukaShift AXS 90 Electronic Controller Carbon Extension 22.2mm Pair A1 MFPN=GY5124 6 Swiftwick Vision Five Fair Isle Swiftwick Vision Five Fair Isle Socks are the perfect sock whether you’re spending the day on the slopes or drinking hot chocolate by the fire Color Black Red Skewer Included No Rear Axle 12mm Thru x 148mm Cassette Body Type Shimano Micro Spline Bearing Type Sealed Cartridge Spoke Interface J Bend Defined Color Black Hub Drilling 32 Hub Brake Compatibility 6 Bolt Disc The Vuka Shift AXS 90 cleanly houses your aerobar extensions shift control and head unit in one neat and clean package More than an aero extension this is an integrated shifting system for the modern triathlon TT bike