THULE 527 Paceline Bike Rack 4.3" high 6.1" wide Auto-clamp adjusts the pressure to different drop-out thicknesses for a secure hold Ergonomic precision dial optimizes fork clamping pressure eliminating damage to fork "D" shaped low profile and lightweight aluminum tray is corrosion-resistant to withstand the elements Ratcheting wheel strap and high-wall wheel cradle secures the wheel to the tray with added protection