Measuring Wheel Offset
To calculate offset you'll need the following measurements:
Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)
Subtract:
Wheel center line from Wheel backspace to get offset.
If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive
Tip:
To convert from inches to mm multiply by 25.4
To convert from mm to inches divide by 25.4
167mm approximately 6.6"
184mm approximately 7.25"
front offset with a 10" rim and 6.5" backspace
centerline is 10" divide 2 = 5"
6.5" backspace is greater then centerline, so positive offset
Find difference of backspace and centerline 6.6" - 5" = 1.6"
1.6" of positive offset = approximately 40mm
rear offset with a 11" rim and 7.25" backspace
centerline is 11" divide 2 = 5.5"
7.25" backspace is greater then centerline, so positive offset
Find difference of backspace and centerline 7.25" - 5.5" = 1.75"
1.75" of positive offset = approximately 44mm
You will proberbly find they came off a soarer or supra with that kind of offset.