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Re: can i use 245/45/18 in front of my 88 735i?? (archive)
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Posted by Eman '94 740i on April 29, 2002 at 09:13:08:

In Reply to: can i use 245/45/18 in front of my 88 735i?? posted by GERARDO RIVERA on April 28, 2002 at 17:21:50:

I am not sure of your original tire size. The calculation for determining correct size is first read the numbers on your stock tires. For example, my original tires were 225/60/15. The first number is the width of your tire in metric, the second number the percentage height (60% of 225) of your side wall and the last number is the rim size.

The formula would be to determine overall wheel size:

((((Tire width)X(Second Number/100))/25.4)X 2)+ third number = OVERALL WHEEL HEIGHT.

For example, since my wheel is 225/60/15

((((225)x(60/100))/25.4)x 2)+15 = 25.63inches

I bought 18" wheels for my car and used 245/40/18

((((245)x (40/100))/25.4 x 2)+18 = 25.72inches

As long as you are within +/- 0.50 inches of your overall height you should be okay.

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