If your afraid to buy them right away you can always test fit it to see if you like it on your G.

 

Here are a few from my phone.

 

I suggest not going any larger than 255/35 in the rear. My offsets are 20x8.5 +5 and 20x10 +18 and I am at -5 on camber. Tire sizes are 235/30 and 255/35. If I had to pick rears again I would go with a 245/35.

 

how about if u have 40 offset rear 20x10 ? .. can u run 275/30/20 ??

 

Depends on how low you want to be and what look you are trying to achieve. If you want to go low that rear size will be too large.

 

i want to be sort of low not slammed.. but that the drop is noticeable

im guessing that with that setup 40mm offset n 20x8.5n20x10 with 245/35 n 275/30
is not going to get me low enough ?

 

You wont be able to go that low in the rear and not rub with the 275. But you can still lower it nicely. You also wouldn't want a 40 offset up front with an 8.5. I'd say more like 30.

Here is a pic of a car with 275/30 in the rear. I think the front may be 245/35 but not sure.