Regulation technical GT2 category

4.0: Rims and tires. 4.1: Front. The front rims are free but must be identical, of a minimum width of 10 millimetres, the tires are free. The diameter of the wheels is free, but the wheels must turn at all times freely when the car is pushed horizontally on the marble of control. The tire must be cylindrical (not of O-ring or of diabolo). ................
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