Might be stating the obvious (to some) but something I didn't realise until I started trying to pick tyres for aftermarket wheels is that the profile figure - e.g. 40 - is 40% of the width.
So for a 255/40/17 tyre - diameter is 255mm, profile / side wall is 102mm (40% of 255), and radius is 17inches.
Learning this made it all make a lot more sense to me. I also have this graphic to refer to. Can't recall where I found it but it's now saved on my desktop!
I also wanted a chunky looking tyre with a solid side wall and after going 245(F) / 265 (R) , have since switched back to 235(F) / 255 (R) as I found the handling was noticeable more boggy and I use the car for fast road and track use. For ref, these tyres are on 18" BBS LMs.
By
sumshiftyguy ·
A new social network for car people set up by The Grand Tour lot. Could take off quite well. Beats sifting throug faceache for car posts.
Well I've jumped on it early. Here's my Tribe if you guys wanna take a look at the goings on in my car world...
https://drivetribe.com/t/Wo6g9PT-SDGQOivTQxcz4g/KA1h7R65Ra-ANMEJnMJjjg