The wheels are:
Front: 8.5 +35 tires are 245-30-20
Rear: 10 +38 running a 285-25-20
It's an AWD so I am nervous. Do you think I should run a 275 in the rear and a 235 front?
Wish I could help with the AWD issue but I don't have any experience with Lexus AWD. On my STi I never staggered my wheels.
Tire size is just as important though. I would normally say 225/35/20 front & 235 or 245/35/20 for the rears if it was rear wheel drive and therefore a difference in wheel diameter wouldn't matter.
I know the wheel diameter had to be within mm's on my STi or I would have blown a diff.
My recommendation would be 225/35/20 & 255/30/20. This would be within 5mm of eachother. Even then you need to do some research to see if that is acceptable.
I really appreciate the suggestions, comments, compliments, and all the help that you all have provided me. I have someone interested in the car but, if he doesn't pick it up, I'm thinking about going with 19's with a more agressive set up. I am going to look into stretching the tires and maybe even a UAS kit. The BC Coils I am on are too much of a pain to keep adjusting till I get the stance figured out. Thanks again to everyone, I really appreciate it. If you have any wheel suggestions, I'm open.
2009 GS350 AWD - Tanabe Exhaust w/Job Design tips / BC Racing Coilovers / Job Design Neo Kit / JBT 4 wheel BBK / Work GS-1 / JDM Visors / Junction Produce Goodies and more stuff in progress