Long ago, offset was the only spec published by the wheel mfrs. When cars got smaller while wheels and tires got larger, some wise man determined that backspace may be a more relevant measurement to use when attempting to upsize wheels.Bill thanks for starting this out with some really great information,
You know I have the dimensions pretty much figured out except for two things
1. The backspacing!
2. The offset!
A lot of the manufacturers show the backspace but I am not seeing the offset and I am unclear about how these two figures may effect each other and the wheel location once in the wheel opening? If I can't get the offset figure how can I be sure what the correct backspacing should be?
I also was wondering what those two figure are on the stock wheels?
When it comes to my stock wheel/tire size it appears I have a lot more room/clearance between the outsides of the wheel/tire then for the inside. My stock rear tires comes closer to the frame rails then any other place?