[brossow]

Originally Posted by fpjr0

edit" but now that I think about it those rear tires are 20x10 with a backspacing for 6.5 and a offset of +20 mm which will offset the 6.5 backspacing down to something just above the 5.5 mark... ? any body? but then again I am probably wrong.

I don't think you understand the difference between backspacing and offset. There's a good discussion here, but in a nutshell offset is how far the mounting surface is from the wheel's center line and backspacing is how far the mounting surface is from the inside lip of the wheel. The offset doesn't change the backspacing -- the two are fixed figures that are related but not in the way you're thinking.