W/Y 88/90 what on earth!!!

The_Dude

Member
Just getting an idea of what tyres I can put on my summer alloys to replace the dreaded run flats. I've looked at the run flats and they're 225/40/18 88w and 255/35/18 90y.

When I've checked on camskill I can get y or w, which I understand is the speed rating, but what's the other number and does either the speed or the other make any difference on a car that's not tracked?

I thought it would be hard enough picking Goodyear/Michelin/pirelli etc!
 
As far as I can work out, anything round and black will be an improvements on the run flats. :P
 
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