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<blockquote data-quote="fabianyee" data-source="post: 107418" data-attributes="member: 6"><p>offset will not affect the circumferrence of the tyre. Rim width also would not affect the circumference.</p><p></p><p>I have also came up with a tyre calc using excel spreadsheet. I was a personal challenge to see how much I have forgotten my maths.hahha.. </p><p></p><p>it's actually very simple. first u get the diameter of the tyre size. then from there u'll get the circumferrence and if there is a difference between the circumferrence of the stock tyre size and intended tyre size, u can get the percentage of difference. </p><p></p><p>eg</p><p>Diameter of the tyre = (sidewall height in mm x 2) + rim size(in mm)</p><p></p><p>sidewall height = tyre profile(in %) x tyre width.</p><p></p><p>So for a tyre size of 195/60/15, the calculation is as followed</p><p>side wall height = 60% x 195 = 117mm</p><p>rim size = 15inch x 25.4 = 381mm</p><p></p><p>Diameter of the tyre = (117 x 2) + 381 = 615mm</p><p></p><p>circumferrence = pi x Diameter = 22/7 x 615 = 1932.86mm</p></blockquote><p></p>
[QUOTE="fabianyee, post: 107418, member: 6"] offset will not affect the circumferrence of the tyre. Rim width also would not affect the circumference. I have also came up with a tyre calc using excel spreadsheet. I was a personal challenge to see how much I have forgotten my maths.hahha.. it's actually very simple. first u get the diameter of the tyre size. then from there u'll get the circumferrence and if there is a difference between the circumferrence of the stock tyre size and intended tyre size, u can get the percentage of difference. eg Diameter of the tyre = (sidewall height in mm x 2) + rim size(in mm) sidewall height = tyre profile(in %) x tyre width. So for a tyre size of 195/60/15, the calculation is as followed side wall height = 60% x 195 = 117mm rim size = 15inch x 25.4 = 381mm Diameter of the tyre = (117 x 2) + 381 = 615mm circumferrence = pi x Diameter = 22/7 x 615 = 1932.86mm [/QUOTE]
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