18×9.50-8 Tire Specification. Section Width: 9.5′. Rim Width: 7 IN. Tread Depth: 0.63′. Max Load: 1040 lbs. Weight: 14.09 lbs. 18×9.50×8 Tire Specification. Tire Type: Lawn & Garden Tire. Section Width:9.5′. Rim Width(in): 7. Tread Depth:0.24′. Load Index(lbs): 1040. Tread Depth: 0.2′.