Toyo Proxas S/T
 

Anyone have this set up for the stock 18 inch 255/55/18 set up?? It seems like most people who use the Toyo S/T have 20s..

I have been running those on my 19's. Good so far. The price is pretty good too. I don't think you can go wrong with them but I must also add that the stock Michelin's in 18" are great tires with extraordinary life. You could always stick with those.

I just bought the 18" Bridgestone Dueler H/L Alenza for mine. Replaced the original 17" michelins and these tires are much nicer. Ride is great, they are quiet, seems like the X is easier to steer. Highway is quiet too. We have the Bridgestone Turanza EL42 on the 323i and they have been fantastic tires. We burned through the Conti's and a set of Pirelli's before these (both were loud). So I'm sold on both styles. You can get the Alenza for $150 a tire on tirerack.com and the Turanza for $247 a tire. I think the Alenza is a great tire for the money and matches the X5 nicely.