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I am running 265/35zr18 in front and 295/35zr18 in back on 18x9.5 and 18x11 rims. No problems. Just had the speedo recalibrated to read correctly.
You should really like the MXs. I use them on the street and the track.
Before I went to 275-35 on 18X10's up front and 335-30 on 18x12's in back, I ran the stock '99 rims with Kumho Ecsta 712 245-40's up front and 275-35 in back. The speedo was a bit off, in read over by 3 mph @ 60. If you have access to a programmer, you can easily adjust the speedo. 255's up front will be fine. Their might be a little more hunt and wander, depending on pressures and alignment.