The 11.8" balloon beach tire was designed and engineered specifically for soft sandy surfaces. The balloon tire is your only choice when it comes to pulling your wagon through the sand. Featuring a solid polypropylene hub and a 7/8" hub diameter, the balloon tire requires very little air to operate in the sand properly. Filling recommendations are no more than 3-4 PSI or a maximum filled diameter of 12.5". The hub does not contain bearings and are shipped deflated. Hand air pumps are recommended over compressors to eliminate the possibility of over inflating the tires. Balloon tires are compatible replacement tires for any Kahuna Beach Wagon.