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Toyo Tires Proxes R888

Tire Sizes & Specs

Toyo PROXES R888

ULTRA HIGH PERFORMANCE RACING TIRE

Toyo Tires introduces the next generation competition radial, the Proxes R888. The Proxes R888’s outstanding design was developed using the latest Toyo Racing Technology, delivering maximum performance through improved cornering grip and braking response. Its durable, special tread rubber compound maintains optimum temperatures for maximum handling capabilities, even during extended periods of competition.It’s the spec tire for both the Castrol Canadian Touring Car Championship as well as the SPEED World Challenge GT and Touring Car Series. Sizes range from 13” to 19” wheels.
Toyo Tires - Ultra High Performance Race Tire - Proxes R888
Proxes R888

 
Consumer Benefit Product Features
Competitive Handling and Improved Performance
  • Advanced casing and V-shaped tread design
  • Stiffer construction and wider tread width enable the R888 to generate more cornering force, with less heat degradation
  • Spiral wound cap ply (construction may vary by size)
Steering Response
  • Semi-slick shoulder area improves steering response
  • Steel wire reinforced sidewalls (construction may vary by size)
Braking Performance and Dry Traction
  • Continuous center contact increases braking performance and feel as compared to the Proxes RA1™
  • Tread depth can be shaved to maximize dry traction
Wet Traction and Control
  • The V-shaped tread design also enhances wet traction and control

General Proxes R888 setup guidelines:

90-110°C - (194-230°F) Optimum

Heat cycle
Note: These tires should not be stored below 0° Celsius to prevent tread compound from cracking.
Do not store inflated.

Click here for recommendations for proper use, handling and storage of this tire in colder climates.
Camber:

“Negative 2.5 degrees to negative 5.0 degrees is acceptable.
Please note that the PROXES R888 requires less negative camber when compared with the PROXES RA1
Castor:

As much positive as possible (very difficult with stock vehicles).
Tire pressure/Air pressure recommendations:

Below are recommendations only, based on approximately 4 laps or more on dry tarmac,
and can vary based on car setup and driving technique:

4 laps or more (pressures based on inflation with compressed air only)

Vehicle
Weight

COLD INFLATION
PRESSURES

HOT INFLATION
PRESSURES

Less than 800 kg.

17 - 22 psi

22 – 29 psi

800 kg. – 1000 kg.

20 – 26 psi

24 – 32 psi

1000 kg. – 1400 kg.

23 – 27 psi

28 – 40 psi

More than 1400 kg.

27 – 35 psi

37 – 42 psi

For wet tracks (standing water), increase pressure by 4-10 psi compared to dry track pressures.
Optimum hot inflation pressures can also vary between front and rear axles based on axle weight distribution.

Changing hot inflation pressure by small amounts (1-4 psi) can be used to fine-tune handling:

Reduce oversteer

Reduce rear axle hot inflation pressure

Increase oversteer

Increase rear axle hot inflation pressure

Reduce understeer

Reduce front axle hot inflation pressure

Increase understeer

Increase front axle hot inflation pressure

Changing hot inflation pressures to change handling bias should be used for fine-tuning only.
Improving overall grip levels should be done by tuning spring rates, sway bars,
suspension geometry etc., and by using lap times and pyrometer readings to asses changes.
 

 
     
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