tire size-in-training

planning on buying some bmw M6 wheels thos thin split 5 spoke ones in 20's. for my LS430. 
Whats a good size of tires i can put? Fronts are 20x8.5 Rears are 20x9.5 both plus 20. without spacers...
 mild stretch (rolling or shaving is fine) thanks in advance.
 
[IMG]http://i56.tinypic.com/av1nhy.jpg[/IMG]

First question, you said without spacers...are they knockoffs? If real m6 wheels, you need adapters to fit, which at the smallest being 15mm, your final et will be 5. So you have to consider that in fitment. 

How low do you plan to be? First thing you need to do is get them mounted without tires and see where you want it to be. Then you can get an idea for tires.

Doback: Going replica sir.yea i need adapters to 5x114.  (Still saving up for some wheels i really wanted)  Might go with 1.25 adapters and lowering it with data controller. So i guess ill get the wheels and test fit it and go from there. 


Doback: saw ur post wheels looking good bro!

Ok, well the adapter acts like a spacer... becuase it is a spacer.
 
If you go with a 25mm (1 inch) then you're going to be -5 offset all the way around.

I don't know the LS430 very well so figure out if that's aggressive then run 215/35 and 225/35 Unless you wanna get really thin then you can buy some Toyo T1rs in 215/30 and do 235/30 on the back.

Figure out the offsets though and figure out how low you can go with the factory air.

Man if you want some replicas I got some in 19" 8.5/9.5 +20 I you want them I'm in Houston! I need to dump these soon need money!