Rage Powersports 20128 BikePRO Narrow Tire Adapter Kit (for Wheel Chocks) Allows Wheel Chocks to work with narrow 3.5" motorcycle tires or smaller Kit includes (4) plastic tire bumpers with mounting hardware Quick release for easy mount and removal Attaches to the inside frame of a Wheel Chock cradle Angled to fit snug on the motorcycle wheel, increasing overall stability with narrow-tire bikes