Focus Fanatics - View Single Post - 02-04 SVT: Recommended Tire Sizes for 18" wheels? Pro and cons?
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Old 02-08-2013, 06:59 PM   #7
Julian@TireRack.com
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Here are some good numbers on the 215/40 and 215/35R18 size.

Tire size............215/40-18..................215/35-18
Section width....215 mm (8.5'').............215 mm (8.5'')
Sidewall............86 mm (3.4'')...............75 mm (3'')
Tire diameter....629 mm (24.8'')............607 mm (23.9'')
22 mm (3.5%) shorter.

Circumference..1975 mm (77.8'')...........1906 mm (75'')
Revs per mile.......814.8........................844.4
Speedometer Assuming that this is OEM tire and speedometer readings are correct >>> When speedometer reads 60mph (96.6km/h) actual speed will be 57.9mph (93.2km/h): 3.5% slower.
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