What is the difference in 6 in offset and 12 inch offset? I looking to run 305/70/17 with 2 inches of lift. I think I need 4.5 in backspacing?


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You shouldn't have a problem with 4.5 bs.

But here is a little info on the subject;

How to Measure Wheel BackSpace
Items required to measure wheel backspace: Tape measure
Straight edge
Wheel w/o tire (preferred)

The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2",3", & 4" backspace.

Measuring Wheel Offset
To calculate offset you'll need the following measurements:

Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)

Subtract:

Wheel center line from Wheel backspace to get offset. If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive


Tip:

To convert from inches to mm multiply by 25.4
To convert from mm to inches divide by 25.4




Backspace to Offset Conversion Chart
The table on the right is q quick reference for finding offset, pick the rim width and follow the row over to the backspace of your wheel.

 

That offset is in milimeters, not inches. The above post describes what you are looking for.

 

I should of known, thanks for the info.

 

I am going to guess that a 5.5 bs won't be enough to clear my tires. right??

 

It's pushing it. You would probably rub at full turn .

 

That is what I am trying to fix. I am running 305/70 on my stock 17 in wheel and rub at full turn. I just found a good deal on ebay, but the backspacing is 5.5. Thanks for the info. Guess I'll stick to the 4.5 wheel.

 

When in doubt.... check it out
http://www.1000rims.com/rt_specs.jsp...00258BA2A57953

 

16" alloy wheels with 5.5" of BS won't clear the calipers most likely. Alloy wheels are thicker, so the clearance inside is less.

And yeah, tires will most likely rub if you are wanting to run 12.50's.