what would be a good offset for a set of 18x8 wheels for an AWD IS250?
would +47 be too much??

 

I dont see a problem with +47 in the back or the front.

But the tire size might be an issue. and width.


Take a look at this thread. This setup is your best bet.

https://www.clublexus.com/forums/sho...d.php?t=211514

 

that offset will work on the is350 i am pretty sure, but don't you think that's a bit too narrow and too conservative? the wheels will be pretty inset on the car, considering that i think a 8.5 +38 will still fit pretty well

tire wise i think it's ok, it's the same wheel all around, so i assume you will get the same tire for all 4 wheels. then it's not a problem