The Speedometer
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The Speedometer
Ok I have had a bunch of people try to tell me that if you get 18" rims and tires or bigger for say a car that uses 16" you would have to get your speed O changed to account for the bigger rim tire size........I think that as long as the Outside Diameter is the same....It should make little or no difference.......Am I crazy?
Registered User
Joined: Mar 2003
Posts: 681
From: Warsaw, Indiana
Car Info: 02 WRX Wagon White
It's all about outer diameter. When you get bigger wheels, it's like a donut with a bigger hole. The tire sizes we recommend reflect the knowledge that the OD must remain constant because the car works best as close to the original diameter as possible. See the "general tire info" sticky post - it's good reading.
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