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Yup - there are plenty of tire size calculators around - but I am a driving instructor. I need to have my pupils comply with the law - especially when they are taking their driving test in my car!
My little automatic has desperately 'short' gears, and it would be great to fit bigger tires... but I need an accurate speedo. As it happens, my automatic has an old fashioned ( non electronic ) speedo, so it would be a matter of making measurements and then having the speedo re-calibrated by a company that does such work.
But a gadget such as is available from the link, would allow you to try different size tires, and correct the speedo calibration yourself, when ever you want... Very handy!
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