I replaced the factory rims and tires with BBS 17X7 rims on my RX300. I got Michelin Cross Terrain 235X65X17. I noticed the difference in handling right away.
I will be getting a RX330 with air suspension in a couple of months and I
am planning to get 255X50XR18 TOYO Proxes S/T series. I may have to get
18X8.5 rims for that. My Dealer also recommended that.