AeroHead low-profile reinforced head combines aerodynamics, durability and style Thule’s One-Key System™ compatible Tool-Free universal mounting makes it simple and easy to install Integrated wheel cradle high-wall design provides protection and perfect fit beneath your wheel Low profile aluminum tray made from corrosion-resistant aluminum to withstand the elements Ratcheting wheel strap quickly secures back wheel to tray Fits most factory supplied rack systems Fits all diameter bike frames Fits Aero profile and Square Bars Compatible with 15mm, 20mm and lefty forks with adapter (sold separately)