Yokohoma ADVAN?

[lifespeed]

Has anybody tried these tires (http://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=ADVAN+Sport&vehicleSearch=false&partnum=555YR8ADSXL&fromCompare1=yes&place=0) on the rear? A bit expensive, but they seem to be one of the few performance tires in the near-correct 255/55/18 size.

I can only find the all season version (http://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=ADVAN+S.4.&vehicleSearch=false&partnum=45VR8ADS4&fromCompare1=yes&place=0) of the ADVAN for the front in 245/50/18. That would appear to bring the F/R ratio pretty close for TC and ABS. A bit of a mismatch in tires, but probably not as bad as different brands. I'm not so sure about going wider on the front. Anybody tried this?

[lifespeed]

OK, got the rears on. Too early for test drive reports. Doesn't feel like an improvement yet, but I suspect I need to add air pressure in the rear tires and lower the air suspension to compensate for the added height.

Update: I set the rear ride height so the car is level now (I think any tire combo would benefit from a level car). Also increased the rear tire pressure from 34 psi to 36 psi. Fronts are stock BFG at 38 psi. I took a ride over some fast freeway ramps with some unsettling bumps along the way. The Yokohamas did pretty well. I do detect a bit more 'bounce' than the lower-profile 245/55/18 BFGs, but this is not a big surprise. I may try 38 psi in the rears, which is what I ran in the BFGs.

I have always been a big fan of BFG KDWS tires. I ran the 50 series on my '97 Crown Vic with 17" X 8.5" Koenig 5.0 wheels with great results. And the BFGs on the front of the Marauder work very well. I am not sure why the rear tires on our cars have such a wear problem. Perhaps the tire carcass cannot support the taller 55 profile (all the BFGs I have used have been 50 series or less).

I suspect that the best handling tire for our cars would be a 245/50/18. Given that size is is verboten by the computer, I think the stock BFG rears are probably going to handle the best, but with poor tire wear. Sigh. Is there any possibility of adjusting this computer parameter?