Brand: Nitto Tires Manufacturer's Part Number: N108-800 Part Type: Tires Product Line: Nitto NT 555 RII Tires Summit Racing Part Number: NIT-108800 UPC: 4981910533979 Wheel Diameter: 18 in. Tire Size: 335/30-18 Tire Weather Usage: Summer Tire Construction: Radial Sidewall Style: Blackwall UTQG Tread Wear Rating: 100 Tire Diameter: 25.94 in. Section Width: 13.50 in. Minimum Recommended Wheel Width: 11.50 in. Maximum Recommended Wheel Width: 12.50 in. Directional: Yes Severe Snow Rated (3PMSF): No Speed Rating: W Load Range: LL Load Index: 95 Asymmetrical Tread Pattern: No Traction Rating: A Temperature Rating: A Tread Depth: 6.3/32 in. DOT-Approved: Yes Run-Flat Technology: No Studdable Winter Tire: No Tube Required: No Max Load Single (lbs.): 1，521 lbs. Quantity: Sold individually. Nitto NT 555 RII Tires These Nitto NT555RII "Extreme R" D.O.T. approved road race and auto cross competition radial tires were developed through a unique fusion between a race circuit oriented stiff sidewall construction and the popular Nitto Drag Radial tread pattern. These features combined with the high traction， specially formulated soft racing tread compound resulted in a competition radial that exhibits impressive control and handling， to provide maximum traction under severe racing conditions. The sidewall construction is optimized for handling extreme lateral acceleration; vehicles may experience rougher riding when used for daily driving. The Nitto NT555RII is designed primarily for competition road racing.Features include:* Improved dry traction due to high block rigidity， ultra-high grip compound， and large surface area contact with the road * Unique tread provides excellent handling capabilities for daily driving * Two wide steel tread belts and two nylon tread cap plies for superior handling characteristics * Steel sidewall inserts reinforce the sidewall for extreme lateral acceleration * Jointless tread cap plies and jointless wound bead wires improve tire uniformity and provide a smooth， comfortable ride * Unidirectional tread pattern allows for high speed and excellent braking response * Unique construction and tread pattern improve rigidity， uniform contact， and wear resistance * Spiral wound， jointless bead wire construction assures strength for stable performance at high speeds * Rim guard designed to protect against wheel damage