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Discussion in 'Handling' started by DAF, May 22, 2005.
what size are my origanal rs4 wheels 225/45/17 are they 7.5 or 8.5 wide
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I would have thought they were either 7" or 7.5" wide for 17" wheels.
The 225 in your 225/45/17 gives the width of the suitable tyre. Converting this into inches gives 8.85 inches, so I guess the wheels are 8.5 inches.
The 45 gives the sidewall height expressed as a percentage of the width. Thus the sidewall height is 225*0.45 = 101.25mm. As you are probably aware, the 17 is the wheel diameter in inches.
The tyre diameter should then be 17 * 25.4 = 431.8 + (2 * 101.25) = 634.3mm