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Would putting on tyres with a bigger or smaller diameter effect the read-out on your speedometer? How does the speedometer get it's information?
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There are 2 different systems. Both get their speeds from your transmission. One does it mechanically and the other by electrical signals. Diameter will not change your speedometer. It will be changed if you change the tire wheel radius.(forget the technical term off tip of my head.) Basically when upgrading wheels or tires you want to keep the total space from the ground to the center of the wheel roughly equal. That being said the speedo will only be off slightly.. for real hell with the speedometer change your rear gears.