Tyre guide..

[Say..."Renno"]

Heres a handy link i use all the time. It helps if you're thinking of changing your wheels and are confused about what tyres to get........

https://www.tyresave.co.uk/tyresize.html

[Eddie70]

I have often found that i get a great deal on Renault Megane tyres or others for that matter ....from Tyres Unlimited based in Cambridgeshire. They allow you to search for your size online and offer mail order delivery at fantastic prices.

https://www.tyresunlimited.co.uk (Ask for Simon ! )

[IainMW]

Lots of links to online tyre websites here viewtopic.php?f=4&t=5942

[AlexB]

The poster meant the tyre size calculator. This link is slightly better, as it includes matching tyres to the rim size.

https://alloywheels.com/tyrecalc.asp

Yes, this topic has been discussed earlier.

[Gazwould]

The maths is a bit irrelevant as tyre manufacturer's don't keep to the sizes.