Originally Posted by en1ma
Well from further research it seems that offsets and backspacing is the same thing so I think tirerack is probably just conservative...
Remember earlier when I said some tire store guys are stupid....
Offset and Backspace are different measurements of the exact same thing. Offset is measured from the dead center of the rim, backspace is measured (not surprisingly) from the back of the rim.
If you really like those rims, go buy them. Or go with something else... I love my Procomps, but my rims are 16inch so they won't work with the tires you already ordered.