Universal aerobar angled risers developed in collaboration with Cycling New Zealand in the build-up to the Paris Olympics. The adjustability helps the team dial in their position with micro adjustments to optimise the bike fit in relation to the UCI geometry rules. For users of the Argon18 Electron Pro RIO and TKO, you require the M5 version. SPECIFICATIONS7075-T6 AluminiumAdjustable angle between 15° and 30° Compatible with 22.2mm external diameter extensionsGrub screw extension mounting systemAccess for internal cable routing INCLUDES1x Pair of adjustable angle risers Mounting hardware for base bar fastening not includedMounting hardware for armrest fastenings not included Base Bar Compatibility Top-down or bottom-up base bar mounting systemsCompatible with M5 or M6 base bar mounting hardware20mm to 40mm base bar mounting spacing 16x armrest fastening locations at 7.5mm increments M5 armrest fastening threads Recommended to use Loctite 243 on all fastenings for safety and security