well i dont know what the problem is maybe it is then, im just going by what the people at the shop said, i didnt actually see it but they said they height of the tire was the issue. so now im looking for a solution so i dont have to go thru the hassle of sending all of it back and wait longer. so 275/45/20 should fit is what your saying?
Your right it 1" biger diameter but it looks like I have more room than that.
I have 275/40 R20's on the front of mine (much bigger int he rear) with no issues however that is on aftermarket rims so I suspect that if you put these on the stock rims the offset isn't right to prevent the rubbing in which case spacers may help. Or it could just be that you needed 40's instead of 45's.....
That would be pretty close 1/10 of 1% speedometer change.