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when you change wheels your rotations of the wheel per minute usually change. you need to measure the overall circumference of the wheel/tire together and compare them to the stock wheels/tires. if it is smaller (which it probably is not) then your car will be going slower than what the speedo shows. if it is larger however (likely it is) your car will be going faster (depending on the size difference much faster) than your speedo shows. it could be off as much as 10mph. so get your tape measure out and get to work so you don't get a big ticket for speeding when you had no clue.
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