Efore you start cal­cu­lat­ing speeds and what ef­fect a dif­fer­en­tial or tyre change will have on top speed in each gear, you need to cal­cu­late your over­all tyre height, which can be done by us­ing the sum out­lined on the op­po­site page. We used 265/35R18 and 2

New Zealand Classic Car - - FEATURE -

To make things eas­ier later on, we’ll con­vert the cir­cum­fer­ence to me­tres — so, 2.018m. One way to in­crease ac­cel­er­a­tion at the ex­pense of top speed in any given gear is by chang­ing the tyre size.

We’ll use a com­mon size of tyre in this sce­nario — one that peo­ple might have up­graded from: a 205/50R16. Now that you have the over­all tyre height, you again need to cal­cu­late the cir­cum­fer­ence.

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