21 x 12 balloon tire and rim assembly for all Bigfoot beach carts. The tire is a 2 ply rubber, smooth for minimum rolling resistance. Wheel is constructed of glass filled nylon and the hub accepts a 1 shaft. Utilizes nylon flange bushings that are replaceable when worn. Heavy duty composite bushing are also available as an option. The capacity is 600 lbs per wheel. This tire works on any surface and excels in a soft environment. Pressure can be adjusted to change the shape of the tire to accommodate different weights or conditions. Rugged and durable. Plastic Bushings included. Inside diameter is 1\