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Wheels and tyres

OZ wheel rim.
Formula One World Championship, Rd11, Hungarian Grand Prix, Preparations Day, Budapest, Hungary, Thursday, 26 July 2012

Formula One cars must have four, uncovered wheels, all made of the same metallic material, which must be one of two magnesium alloys specified by the FIA. Front wheels must be between 305 and 355mm wide, the rears between 365 and 380mm.

With tyres fitted the wheels must be no more than 660mm in diameter (670mm with wet-weather tyres). Measurements are taken with tyres inflated to 1.4 bar. Tyres may only be inflated with air or nitrogen.