Join Date: Nov 2001
Location: North Central Illinois
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Re: off set and back space.....
Offset rims are determined by how much in or out the flange is from the centerline of the wheel . So, the actual distance changes with different width wheels . A 15X8 with a 1" neg. offset would have a backspace of 3" . The same offset on a 15X10 would give it a backspace of 4" . So , your 15X7.5 with -5mm offset would be roughly 3 5/8" backspace . Think I've got that right , it does get very confusing . Best way to measure them to be sure of clearance for brakes, springs , ect is use "baskspace" measurements , which is done from the inside lip of the wheel , to the inside of the mounting flange.