Calculating Tyre Sizes - Alfa Romeo Forum
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There has been a recent thread in the Tuning and Upgrades section, about the right size tyres to fit when fitting larger wheels, started by Banny 69. I see that he fitted a size that he was happy about. For the rest of you who are contemplating larger wheels I can recommend a website where you input your existing wheel/tyre size into a calculator to give you its circumference and by the side of it you input the new wheel size and a nominal section/profile of the tyre you intend to fit to give you its circumference. You then compare the two with the resulting difference showing you how much your speedo would be out using that tyre size and also a profile of that difference. By playing with the section/profile sizes you can see which tyre combination best suits you before you buy some expensive tyres which could put your speedo way out. That website is: Select "wheel & tyre bible" and scroll down to the bottom of page 2. There is also lots of other useful information on the site especially about E.T.or offset of your wheels.
Hope this of use to you all
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Re: Calculating Tyre Sizes

Cool. I like the bit about the stripes on the tyre; ".. not many tyre fitters know what these mean"! Ain't that the truth..?

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