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Seeing so many mixed responses in reference to tire sizes on a 20" staggered set up. So someone simplify it for me. As the title says, optimal size! Ill be running a 1" drop.
F - 20x9....best tire size? 255/35/20?
R - 20x10.5....best tire size? 295/30/20?
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You won't find many 295/30/20's, though. The only cheap-ish one, would be the Proxxes A/S tire. Unless you want to spend a ton of money on some Pilot Super Sports.
You could do a 295/35/20 with the Nitto Invo, though.
Nitto is what you'd have to run for those sizes...well, let me say, you could find other tires, but the Nittos (555, NT05, Invo) will be your best bang/buck.
What drop and how much of a drop is that you're running? Any rubbing issues ever?
I'm just now seeing this. The suspension is Eibach Sportlines, Tokico D-Specs, and a UPR adjustable panhard rod. The wheels/tires are big enough that the rear being even 1/8" off center is noticeable, so I spent a couple of days really getting it centered.
The fronts never rub. The rears don't usually rub, but they will if I have a lot of weight (200+lbs) in the rear seat or trunk. I've found that setting the front struts to a softer setting will minimize rubbing in the rear. It doesn't really seem to matter what setting the rears are on, but if the fronts are stiff, the energy from a bump will be sent to the rear.
Rubbing doesn't bother me. Cars don't look right unless the wheel openings are filled. I've never owned a car that didn't rub some. If you're nervous about it, then go with a smaller tire or less drop.
Optimal tire size! 
