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View Full Version : wheel and tyre gurus!



dickiemint
Thursday 16th April 2009, 16:29
Not Volvo I know, sorry, but for my other car a polo.

I've been offered some cheap alloys for it, current tyre size is 175-65-R13.
Alloy tyre size is 175-65-R14.

I know that the wheel size is obviously bigger, but can anyone tell me how much bigger the overall diameter is? I'm pretty sure I read somewhere that the profile size is based on a percentage of the width?

Anyone know what the difference is?

Many thanks R.

Redbrick
Thursday 16th April 2009, 18:56
Have a play with this:

http://www.miata.net/garage/tirecalc.html