Quote Originally Posted by woodym3 View Post
From a Bimmerforums post (note this was on an autocross course with 15" tires on a Honda Civic. Your heavy BMW on 17 or 18 inchers on a track may have different results.):

I'm not sure this really tells us much, tested in 15" sizes on an ST civic, and so not including any Yoks and on a much lighter car, but here are the results copied from miata.net:

For the June 2009 issue. Just got my Grassroot motorsports where they did some Extreme tire testing. Tires were tested in 15 inch sizes on a hond civic.

Here is a summary of times from worst to first.

6th - Falken RT 615 Mean time: 35.302 Sec Quick time 35.125 Sec.
5th - Dunlop Direzza Sport Z1 Star Spec Mean time: 35.209 sec. Quick time 35.061
4th -Toyo Proxes R1R Mean time: 34.522 sec Quick Time 34.452 sec
3rd- Bridgestone RE-01R Mean time: 34.478 sec Quick Time 34.430 sec.
2nd- Bridgestone Potenza RE-11 Mean time: 34.266 Quick time 34.238 sec.
1st - Kumho ECSTA XS Mean time :34.170 Quick Time 34.030 sec.

All tires were shaved to 3/32 nd and test performed on an Autocross set up.
Those results aren't really surprising to me ...

Those ECSTA XS's are really more of a comp and not a "street" tire IMO.