New rims, MPH off?!?!?
#26
05-08 SCCA BS Natl Champ
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Tire Size Sidewall Diameter Circumference Rev/Mile Difference
225/55-16 4.9 in. 25.74 in. 80.88 in. 783 0.0% OE 16"
225/45-18 4.0 in. 25.97 in. 81.59 in. 777 0.9% OE 18"
225/40-18 3.5 in. 25.09 in. 78.81 in. 804 -2.5%
245/40-18 3.9 in. 25.72 in. 80.79 in. 784 -0.1%
255/40-18 4.0 in. 26.03 in. 81.78 in. 775 1.1%
Anything within 1% should be fine, at 50mph your speedometer would be 1/2mph off.
225/55-16 4.9 in. 25.74 in. 80.88 in. 783 0.0% OE 16"
225/45-18 4.0 in. 25.97 in. 81.59 in. 777 0.9% OE 18"
225/40-18 3.5 in. 25.09 in. 78.81 in. 804 -2.5%
245/40-18 3.9 in. 25.72 in. 80.79 in. 784 -0.1%
255/40-18 4.0 in. 26.03 in. 81.78 in. 775 1.1%
Anything within 1% should be fine, at 50mph your speedometer would be 1/2mph off.
Last edited by ULLLOSE; 11-12-2008 at 02:40 PM.
#27
It's Not Easy Being Green
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http://www.wheelsmaster.com/rt_specs...&text1=&text2=
Put your stock wheels/tires in the left and your new wheels/tires in the right. There is a row in the table that is generated below that computes the change in your speedometer.
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