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.

  • 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

Detailed Information

Type and Size
Tire Model
Nitto NT555RII
Car Type
Rim Diameter
18 "
285 mm
Aspect Ratio
35 %
Special Features
Mud and Snow
Extra Load
Speed and Load
Speed Index
Z (max > 149 mph)
Load Index (max load for a tire)

Nitto NT555RII Sizes & Specifications

Rim Model Size Index Features
R18 285/35 R18 97Z 285/35 R18 97Z

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