There are several tire manufactorers that produce tires that meet the original factory spec-ed Bridgestones. The originals are P245/60R18 mud-and-snow all-season. If you do a search on Tirerack.com:

http://www.tirerack.com/tires/Compar...rk=1&x=10&y=12

I put Pirelli Scorpions 255 55H18 V-rated on my VX - the change in dimensions place the general tired dimensions at the same level, so that the speedometer/odometer are unaffected. You may safely change your tires even more drastically - several on this list has done so - however some trimming of the front cladding may be involved. Do a search for "tires" to see the additional threads. At Tirerack, you have additional options at this size:

http://www.tirerack.com/tires/Compar...ark=1&x=9&y=11

-- Best, John