If you replace a car's wheels with smaller ones will the speedometer reading be faster or slower than the car is actually going?

Cars & Vehicles

Faster as there is smaller wheel circumference per rotation.

If your wheel is 1m around, your speedo will have been configured to know that you will travel 1m per rotation but if its only 90cm the car will still think you have done 1m per rotation so therefore you are actually travelling slower than your car is telling you.

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Will speedometer readings be more or less than actual speed when the cars wheels are replaced with smaller ones?

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Will a car go faster if it has smaller front wheels and bigger back wheels?

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Do Smaller wheels make a car go faster?

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