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Hello ya"ll. i have a 2003 Durango RT with its stock 17x9 rims and tires on it. My truck is completely stock for now. Im looking at a set 20 inch Black Rhino Peak matte black wheels rims and the size is 20x10, bolt pattern is 6x4.5 6x114.3 +20 offset. Will these fit without having to adjust the shakles or any other mods? If so that awesome, but then what would be the biggest size of tire I'd be able to use with it to fill up the wheel well???
 

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Ok short answer is Yes. More in depth answer is Tire size is critical. What is stock size tires?
Take stock size tires and plug into this basic mostly accurate formula
Size(first number)/24.5 That gives you width eg. 265/24.5=10.816
Multiply that by aspect ratio(second number) eg. 10.816x.50=5.408 that is sidewall height
multiply that number times 2 and add rim diameter eg 5.408x2=10.82+20=30.82 total tire diameter
So a 265/50/20 tire is about 31" tall and 10.816 inches wide

Now use this formula to find your actual stock dimensions and then find a 20" tire that is close to that.
You can go a little bigger but be careful.

STEVE
 

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Discussion Starter #3
Oh wow thats a great formula Steve, thanks alot bro. N btw my current stock tire size is 265/70/r17 i believe.
 

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Pretty sure there are 25.4 mm per inch. So formula I've been using is
(Size (in mm)/25.4) [to give section width in inches] x aspect ratio (as a decimal) [to give sidewall height in inches] x 2 [2 sidewalls] + rim diameter (in inches) = tire diameter (in inches).
e.g. 275/60-17 (the factory tire size, at least on my '01 R/T) gives 275/25.4 * .60 * 2 + 17 = 29.99", and the tires measure out to about 30" in diameter.
The snow tires I put on in the winter are 255/70-16 on non-R/T rims (lots of calcium chloride in use in Oregon) measure out to about 30" also, but they appear to have slightly
more clearance in the wheel well. Both the 17" and 16" rims are 8" width, so maybe they have slightly different backspacing/offset. I've never measured the backsides.
The 275/60-17 tires are PERILOUSLY close to front wheel well inner fender at the front side and front wheel well fender flare flange at the rear side that extends into the inner fender. Might
get away with 1/2" overall diameter larger - depending on offset and ride height - but it will be awfully close. 285/40-20 to 295/45-20, if there are such things.

My R/T is at factory ride height, FWIW.
 

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265/50/20 are 30.5"* 30.6' depending on manufacture, fits a 8-9" rim nice.
 
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