Sedona Tire & Wheel builds products for today's modern ATVs, UTVs / side-by-sides, and off-road motorcycles that offer high-quality, cutting edge technology and real world performance. Constructed of ultra-high-grade synthetic and natural rubber for long life and pinch resistance. Strong 2 mm thickness. Top quality at an economical price. Talcum powder coated for easy installation. Rigid, attractive box for easy stacking. Tube Specifications: Tire inner diameter (inches): 18. Width (inches): 5.0 / 5.1. Stem type: TR-4.