In partnership with Mopar, Thule, the leading US manufacturer of car rack systems, offers roof-mount bike carriers. Thule roof systems offer the most flexibility by allowing you to easily mount your bike rack to your vehicle's production cross bars or a Thule multipurpose rack system. Available in Upright and Fork-Mount styles and compatible with the Thule One Key System. This is a Mopar-approved Specialty Accessory. Thule Upright 599XTR Big Mouth, the upright bike carrier that sets the standard for bike carrying flexibility and ease-of-use. Worry-free automatic self-adjusting jaws for perfect bike clamping every time. Accommodates bike frames up to 3-1/8 inch diameter. Dual- locking design locks bike to carrier and carrier to rack. clamps to all cross bars.