[ISFChamp]

The IS350/250 wheels will not fit !! The IS Sport wheel will not even fit the IS-F. I would be very careful on trying rims other than what's on there because those brakes and calipers are huge. I placed a call into Lexus to get the offset's for us !! I should know by Monday !!

 

[ISFChamp]

Ok everyone, sorry it took me so long to get this information!! Here is the following information : Offset for the fronts is 45.8 mm, and the rears 55.0 mm.

If looking for snow tires, here is what Lexus recommends for wheel size:
Overall Size : 18 x 7.5
Pitch Circle Diameter : 114.3 mm
Offset: + 40mm
Center Bore : 72.62 mm

225/45/R18XL for the front
255/45/R18XL for the rear

I know the following tires work fine :

Michelin Pilot Alpin PA2
Blizzak LM-18

These tires can be ordered thru the dealership !!