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Originally Posted by stickyfingerz
Yes it changes the rate at which the wheel spins relative to your actual speed. There is an equation that they can do to figure out the proper size for a new speedometer gear if its an older car. With newer electronic speed sensors there is sometimes a gear also. If not you may be able to get the computer in the car adjusted so your speed is showing correctly.
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this is correct ...when you change the overall size of the tire the speedometer will be off and the difference will increase with speed. it will also effect your mileage ...
and the rougher ride is just an effect of having less rubber between you and the road ...