Tyres are best stored in a cool, dark and dry environment away from direct sunlight, high temperatures or high voltage machinery. The life and performance of competition tyres will be improved if they are ‘scrubbed in’ before being run at racing speed.
Kumho motorsport tyres are of tubeless construction and therefore need to be fitted with extra care to ensure perfect seating of the tyre bead without damage to the rim flange. The use of a suitable tyre fitting machine is strongly recommended. Rims should be carefully latchecked for cracks, rust or any damage which may prevent an airtight fitment.
Tyres should not be inflated above 40 psi (2.7 bar). If the beads do not seat at this pressure, deflate the tyre, rotate the tyre 90 degrees on the rim and re-inflate to 40 psi. If this fails to seat the bead, the assembly should be put into a safety cage and inflated to a maximum 65 psi. Failure to use a safety cage could result in serious injury.
The correct pressure varies according to driver, car and track conditions; it is often a matter of personal preference, but sufficient pressure must always be used to avoid structural damage to the tyre.
Heat Cycling of Competition Tyres
All competition tyres benefit from heat cycling. Heat cycled tyres show more consistent performance, prolonged life and reduced wear.
Heat cycling the tyres consists of one or two cycles of running the tyres under load without sliding or unduly stressing the tyres.
The following is a suggested Heat Cycling Procedure:-
Each cycle should consist of the following steps:
1. Mount the tyres set the tyre pressures at the recommended cold tyre pressure
2. Run 4-5 laps of the circuit at approximately 50% of normal race speed and
3. Reset tyre pressures to the recommended hot tyre pressure
4. Run several consistent laps over a period of 10-15 minutes commencing at approximately 50% of race speed and gradually building to 80% of race speed.
5. Do not over stress tyres and avoid driving over kerbs, ripple strips or any other undulations on the track.
6. Remove tyres from the car or raise the car or axle stands and allow the tyres to cool naturally to the ambient air temperature.
7. Maximum conditioning occurs when the tyres are cooled unloaded and after a period of 24 to 48 hours.