The Thule 532 - Ride-On Adapter is designed to allow those with strong factory installed cross bars to attach up to two bike mounts, enabling transport of two bikes weighing up to 36 pounds each.  The Ride-On Adapter included two 32 inch Thule standard rectangular tubular steel load bars and universal mounting hardware to connect to the factory cross bars.  The universal mounting hardware is attached to the factory cross bars using tamper proof fasteners.  Choose from Thule's excellent line of aerodynamic fork mount bike carriers or Thule's easy to load upright carriers to complete your bike transport system.