How do you work out the speedo turns per mile?
My Minor has a Marina rear axle and T9 Ford g'box and runs on 13" marina wheels
In-accurate speedo
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mike.perry
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Re: In-accurate speedo
It all depends on the final drive and tyre size. On 948/1098/1275 boxes the speedo drive gear is the same ratio and the top gear ratio is 1:1 so you can compare the diff ratios.
There is a website http://www.etyres.co.uk/tyre-size-calculator.htm
There is a website http://www.etyres.co.uk/tyre-size-calculator.htm
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