Your speedometer might be lying

According to the website TyreSize Calculator…

If you install tyres on your vehicle, with a diameter larger than your original equipment tyres have, the wheel with the new, bigger tyre, with each revolution, will cover greater distance as compared to the original tyre, for the same time interval.

Read more about the physics of the problem and use a calculator to work out your real speed if you use non-spec tyres here.

About Mark Lyndersay

Mark Lyndersay is a writer and photographer based in Trinidad and Tobago. He writes editorial leaders for Guardian Media Limited, for whom he has written more than 1,300 since 2001, feature writing and reviews and his column, BitDepth, which has examined personal technology issues continuously over the last 20 years. As a photographer, he divides his time between commercial assignments and annual report photography and personal projects like Local Lives, which examines the backstory of life and culture in Trinidad and Tobago.

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