49N Kids 20” Coaster Black Rear Wheel Nutted Bike Storage and Car Racks Although Third party testing confirms that Size:Large Xlarge Although Third party testing confirms that the Exoshield HeadGuard significantly reduces the force of impact to covered areas there is no conclusive data showing that the ExoShield HeadGuard prevents concussions which can result from a combination of factors including direct impact to the head Bunnock is a bone toss game (using replica horse anklebones) that can be played by people of any age and ability Tough yet affordable single wall rear 20” (406mm ISO) coaster wheel that uses a much higher build standard and materials than many original factory equipped wheels Alex Y303 pinned construction single wall rim with 24mm internal width for excellent pairing with modern high volume tires