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Ok,.....I've been told over and over again that running a "ready made" 20" wheel (something other than custom offset billet) and 275/45's would rub with my 4/6.

I am currently running stockers with 255/70's right now and its perfect, no rubbing on the fenderlips (unless i haul heavy things) or the front fenderwell when i hit a big dip.

Whats makes the 16" - 255/70 combo work when the 20" - 275/45 combo wont?

What backspacing would i need on a 20x8" and a 20x8.5" to equal that of the stock wheel?
 

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I don't own a lowrider
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On a 20x8 you will need 5.5" of backspacing. On 20x8.5 you will need 6" of backspacing for the 275/45 to work.

Most aftermarket wheels have a 20x8 with 5" of backspacing, or 20x8.5 with 5.5" of backspacing, not enough to sit the tire inside the wheel opening enough. A half-inch can make a huge difference when you are this low.
 

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the stock 255/70/16 extends 3.8 inches past the hub mounting surface.
a 275/45/20 on a 8.5 inch wheel with 5.5 bs (the most common) extends 4.5 inches past the hub mounting surface, .7 inches more than stock. and extra half inch of backspacing (6.0 inches total) would bring it within .2 inches of the stock set up.
 
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