This bike rack is the ultimate in fork mounts for bikes with disc brakes. The Thule Echelon truly raises the bar with it’s newly improved ETC (Equalized Twin Cam) clamping system and extremely stout wheel tray. Replaces the V2. Note: Xadapt 9 needed to mount Echelon on Thule Rapid Aero bars or Xsporter bars. Features: Centrally located cam lever and ergonomic adjustment knob allows rapid loading/unloading of bicycle. Fits all disc/suspension combinations with standard 9mm axles. Dual-lock design, locks bike to carrier and carrier to rack. Wheel tray fits tire widths up to 2.6" wide w/ high profile rims. Carries bicycles with wheelbase up to 48". Fits both Thule Load Bars and Yakima Round Bars. Thule One-Key System compatible - 1 Lock Cylinder needed to secure (not included).