My math skills are a bit off today. I suppose if I think about this a little more, I'll figure it out. But
Offset - Distance between mounting surface and centerline of wheel.
Backspace - Distance between mounting surface and inside edge of wheel.
I had this wheel on my 2008. 17x8.5, 0 offset, 4.75" backspace. These seem to make sense. Wheel a little over 9" wide, half that would be 4.5", so with zero offset, backspace would be in that range.
I think these are on my new Jeep. I say "I think" because they were on the vehicle when I bought it, and don't have exact part number. Haven't looked in detail to get the exact model, but looking at the picture, they look the same. Both are ProComp.
The specs on the 2nd one have about the same width 17x9, same backspace of 4.75, but an offset of -6.
If this was what was really on my Jeep, I'd expect the wheel to be way outside the fenders, but they are not. Looks about like the stock ones. Plus, I don't see how it could have -6 offset and same backspace, for essentially the same size wheel. If I have same width wheel, if offset goes negative, doesn't backspace get smaller, by definition? How can they both have the same backspace? -6 inch offset from center would push wheel way outside the vehicle and the mounting surface would seem to be outside the wheel, since at -4.75 offset the mounting surface would be right at the inside rim.
What am I missing here?
I suppose my vehicle might have a similar looking wheel, that doesn't actually have -6 offset, but this doesn't look like -6 offset. But my real question isn't about what I have but is it even possible?
Can a 17x9 wheel have a 4.75 backspace, and -6 offset? Is that even possible. Wondering if the description is wrong.
Offset - Distance between mounting surface and centerline of wheel.
Backspace - Distance between mounting surface and inside edge of wheel.
I had this wheel on my 2008. 17x8.5, 0 offset, 4.75" backspace. These seem to make sense. Wheel a little over 9" wide, half that would be 4.5", so with zero offset, backspace would be in that range.
I think these are on my new Jeep. I say "I think" because they were on the vehicle when I bought it, and don't have exact part number. Haven't looked in detail to get the exact model, but looking at the picture, they look the same. Both are ProComp.
The specs on the 2nd one have about the same width 17x9, same backspace of 4.75, but an offset of -6.
If this was what was really on my Jeep, I'd expect the wheel to be way outside the fenders, but they are not. Looks about like the stock ones. Plus, I don't see how it could have -6 offset and same backspace, for essentially the same size wheel. If I have same width wheel, if offset goes negative, doesn't backspace get smaller, by definition? How can they both have the same backspace? -6 inch offset from center would push wheel way outside the vehicle and the mounting surface would seem to be outside the wheel, since at -4.75 offset the mounting surface would be right at the inside rim.
What am I missing here?
I suppose my vehicle might have a similar looking wheel, that doesn't actually have -6 offset, but this doesn't look like -6 offset. But my real question isn't about what I have but is it even possible?
Can a 17x9 wheel have a 4.75 backspace, and -6 offset? Is that even possible. Wondering if the description is wrong.