Correct spare wheel?

[Mike S]

Andy said this in a related thread:

"The correct wheels are 15 inch, zero offset 6 holes on a 5 1/2 bolt center."

I ordered a wheel for my '77 Argosy to use as a spare. I measured it and found that it has 3-1/8" backspacing (face of the wheel/hub bearing surface to the inner edge of the rim). It is 7" wide (edge to edge) and 6 on 5.5" bolt pattern, which is correct for my trailer.

I am uncertain that I have the right rim. Please advise me is the backspacing is the same as the "offset" that Andy posted about.

Thanks

Mike

[easyride]

Then measure from the front side and it should be about the same ,the center of the wheel takes up some space.