The OTR OR-NDX 23X10.50-14 Airless Tire Assembly is a complete bolt-on airless tire and wheel assembly for commercial zero-turn, riding, and stand-on mowers. Engineered to eliminate flat tire downtime, the OR-NDX Neverdown system uses a patent-pending multi-layer construction with a Zero T II tread pattern. This assembly fits machines requiring a 4x4 bolt pattern with a -2.25" offset. No air required -- ever.