Pre-Mounted Trailer Tires & Wheels. 4-Pack Trailer Tire & Rim Bias Ply 18-8.50-8 Load B 4-4 White Conventional 8. Tire Size: 18-8.50-8. Aspect Ratio: 8. Section Width: 18. Load Range: B. Tire Weight Rating: 760 Lbs.. Maximum Pressure: 35 PSI. Tire Composition: 4 Ply. Tread Depth: 8.4/32". Sidewall Description: BSW. Internal Tire Type: Tubeless. Rim Size: 8" X 7". Bolt Configuration: 4 Lug 4" Center. Offset: 0". Center Bore: 2.83". Rim Construction: Steel. Rim Style: Conventional. Rim Color: White. Pack Quantity - 4-Pac