OTR 13x8.00-6 OTR Smooth Tire 4 Ply 13x8.00-6 OTR Smooth 4 Ply Tire Used on Walker and Xmark mowers Round shoulders and wide flat tread design prevents turf damage. This tire is Tubeless, no tube required. For more tire specs, see "Details" above. Check... $49.85 Add to Cart