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do you have the original wheels and original size tires on the car? if you put aftermarket rims / tires the circumference of the total wheel is different than how it came from the factory, hense causing the speedo to be off. If you have factory sized tires then I don't know what the problem would be that would cause it to be a consistent 20 km/h off. Did you figure this out with one of those police "your speed is XXX" things? If it is off only a little at slow speeds and gradually gets more off the faster you go then you definitely have a wheel ratio problem.
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2005 Corolla XRS Silver Streak Mica
2005 Kawasaki Z750S Candy Plasma Blue
1993 Kawasaki EX500a Luminous Polaris Blue
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