This trailer tire is designed for excellent handling at high speeds. Resists rust and corrosion. White powder coat finish over e-coat primer. Tire-and-wheel assembly meets Department of Transportation specifications. ? Rim dimensions: 8" diameter x 3 3/4" wide ? Bolt pattern: 4 on 4" ? Wheel bolt size: 1/2"-20 ? Pilot diameter: 2.5" ? Tire size: 5.70-8 ? Section width: 5.9" ? Outer diameter (when inflated): 18.0" ? Load range: C(6 ply) ? Maximum load: 910 lbs at 75 psi ? Limited 2-year warranty on tire ? Limited 1-year warranty on wheel ? Trailer tire and wheel assemblies are not meant to be balanced. To determine the bolt circle on hubs or wheels with an even number of studs, measure center-to-center of studs directly across from each other on the diameter(bolt patterns are always measured in inches). Example: 8 on 6 1/2 would mean 8 studs with 6 1/2? center-to-center diameter.