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Tyre pressure for competition racing

The table below gives you some guidance for tyre pressure in competition. These values are not approved for use on the road. Please readjust to original settings when you leave the circuit

Pressures indicated are for informative purposes only, experienced drivers are free to modify them according to preferences and mechanic limits. Pressure should be adjusted in increments of 0.15 psi for more precision

In order to prevent irregular wear on DOT certified tyres, you are strongly advised against under-inflating your tyres. Under-inflated tyres lead to the appearance of circle shaped wear on the shoulder block.Correct inflation keeps risks to a minimum.

Driver's behaviour is key to ensure tyres wear evenly.

Vehicle typePositionPressure
Front wheelFront34.8/ 45psi
Rear2.1 / 34.8 psi
Front engine/ Rear wheel driveFront34.8 / 45psi
Rear30/40psi
Rear enginer/ Rear wheel driveFront34/45 psi
Rear34/ 40 psi

How to reduce under or over steering

The table below describes customized geometry settings adapted for competition racing. Those values are not adapted for driving outside the circuit. Please turn the settings back tho their original values when leaving the racing venue

Adjustements Reduce under-steer Reduce over-steer
Pressure front tyre Lower Higher
Pressure rear tyre Bigger Smaller
Width front tyre Larger Smaller
Width rear tyre Smaller Larger
Camber front wheek More positive More negative
Camber rear wheel More negative More positive
Toe in front wheel More toe-out More toe-in
Toe in rear wheel More toe-in More toe out
Castor front wheel Softer Harder
Caster rear wheel Harder Softer
Front anti-sway bar Soften ( thinner) Stiffen
Rear anti-sway bar Stiffen Soften

Driving in the rain

In case of rain, you are advised to overinflate your tyres by approximatively 5.8psi in order to limit the risks of aquaplaning.

Quick reminder, aquaplaning occurs when a layer of water gathers between the contact patch and the road. It can leas to a loss of traction.

Increasing pressure rounds the profile of the tyre, reducing the amount of deflection.

As a consequence, the contact patch gets thinner and narrower so that it keeps the grooves in the tread open to channel off water.