The Supersonic/Ergo+/SLC series aerobars offer industry leading ergonomics, adjustability and low weight – maximizing your comfort and speed. The Supersonic is the top model of the Flyt series brackets – utilizing an innovative internal wedge clamp to securely hold the extension. It offers easier adjustments and a greater fit range than anything that came before it. It is now paired with the new Ergo+ armrest that takes the popular Ergo shape and adds 40mm of length as well as a new textured cushion. FEATURES: Performance: The Supersonic/Ergo+ platform is designed to give riders the freedom to find their best possible position with a huge range of independence adjustments. Fit Data: Armrest Offset: -85mm to -17.5mm in 15mm steps Armrest Width: 124mm to 290mm in 18.5mm steps ( With Extensions at 100mm) Armrest Stack: 58.5 mm (no riser kit) to 138.5mm in 5mm increments (With aftermarket Riser Kit) Extension Shape: The 35 slc extensions offer a 35 deg ski bend shape. This facilitates a slightly turned down wrist position to create a streamlined hand position. Accessory Options: The Supersonic bracket can be paired with the Supersonic BTA mount - specifically designed to give a secure, clean and adjustable bottle cage mount for this bracket. SPECS: Bracket: Supersonic Clamp Diameter: 31.8mm or (26.0 with Shim Kit - Shim Kit is sold separately) Armrest: Ergo+ / 10mm Pads Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) Armrest Offset: -85mm to -17.5mm in 15mm steps Armrest Stack: The minimum is 58.5mm and the bracket is compatible with our existing risers which add up to 138.5mm stack with (70mm of spacers added)