If a tyre of a different size or aspect ratio is fitted, this will affect the speedo. To check the effect of the tyres on the speedo, measure the rolling radius of the front tyre and rear tyre. [...]
Paul’s tips on how to go about it! (Part 1) NOTE: While the following is written mainly around the MGB, it also applies equally to the MGA and Midget other than remembering that Midgets are a [...]