RockyMounts TieRod Low profile, solid metal head fits 99% of the elliptical and factory crossbars on the market Stainless steel, long-throw, lockable quick-release makes loading bikes easy and fast Compatible with disc and standard brake systems Holds skinny road tires to 2.7" mountain bike tires Securely lock your bike to the rack and the rack to your car with Rocky Mounts lock cores (sold separately)