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Ray
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We opted to use two set of tyres/rims for each car all shod with supergrips untreated but using one set of solids and one set of air system rims. The difference was dramatic all of the four teams ran the solid rims for the shortest stint possible (we had 4 compulsory tyre changes and had to change the rims every pit stop, no length of laps specified.

We normally treat tyres with NSR oil or CRC 226 until the balloon or bubble in the centre of the rim (tyres are glued on). The bubbling is caused by the rubber expanding no need for exotic gasses etc.

Regards

Ray
 
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