Gravel Tuff GTF-12WFF 12" Flat Free Replacement Wheel Gravel Tuff's Replacement Wheel will get your equipment where it needs to go Made of high-density polyurethane material with a sawtooth tread for a flat-free tire; this wheel is the ideal size with a wheel diameter of 12" Has a weight capacity of 330 pounds! Contains a 5/8" bearing and a 4 1/4" centered hub The zinc-plated finish adds even more durability and long-lasting quality to this great product 1 year limited Manufacturer's warranty