OK, I've researched a bit more.
this backspacing and offset thing seem to be two ways of finding out the EXACT same information. So why did they start to talk "backspacing" in the past couple years.
Backspacing is the distance from the back of the wheel to the back of the mounting hub
Offset, as has been the standard forever, is the distance in millimeters OUTWARD or INWARD from centerline of the wheel to the mounting hub.
So to me, what's the point of measuring backspacing, it just causes confusion, and here's a perfect example.
I'm looking at wheels for the Hellcat that will look aggressive and not "cheesy aftermarket looking" so I can take off and store the forged OEM wheels, so if/when it comes time to sell the Hellcat, the OEM wheels will be immaculate, adding to the value of the car.
I'm also wanting to find 20x10 wheels so if I decide to put 305's on the car, it's within the recommended rim size and I don't have to worry about ballooning or anything putting 305's on a 9.5 inch wide wheel.
The wheel I am looking at is a
20 x 10
says it has a offset of 25 mm
Which is perfect compared to stock. Wheel won't stick out any further than current OEM wheel, but actually the face of the wheel will sit inward a measly 1 millimeter, but because the wheel is 1/2 wider the additional 1/2 inch is all on the inside, meaning it's wider inward toward the suspension and tucking under the wheel wells.
However, this same wheel says it has a backspacing of 6.50"
Well, how in the heck can it have a 6.50" backspacing but have an offset of 25mm from the centerline of the wheel. There is a 1/2 inch discrepancy there.
So either the wheel has a 25 mm offset and a 6.00 inch backspacing or
the wheel has a 6.50" backspacing or a roughly 38 mm offset
So unless I'm missing something with this backspacing stuff, I don't know which to believe on this wheel.???