Originally Posted By Speedmog
The Avon ZZR which I think may be OE on Aero's now is a Y rated tyre as are the Pirelli's on my S1. The 888's in 225/40/18 size are only W rated which is lower than the std tyres.


This is the point that I was trying to make Phil. smile

Originally Posted By Speedmog
I think ZR is a generic term for high speed rated tyres, however there is still another pure speed rating after it, see:

http://www.carbibles.com/tyre_bible.html


I also Googled and came up with this site on ratings. This was the site that I was quoting from and you can see they specifically quote the ZR rating below the main table.

My car is fitted with Avon's, but I need to go downstairs and see what exactly they are rated at...


Brian

1970 Morgan Plus 8 - Moss Box (Indigo Blue)
2014 Morgan SP1 (Rocket Red)
2015 Morgan Plus 8 (Rocket Blue)