Originally Posted by STRATTON 
butch of tools over there, they dont use offsets, they use back spacing in inches, well i measure the back of the rim to the inside hub, give him the measurement and he doesnt know what to do with it. **** if i know what to do with it.
adam if it would be possible, could you pull your rim, throw a straight edge across the outermost part of the back of the rim to the hub.
maybe then he will be able to give me what i want.
stratton.
Calculating the offset of a wheel is a fairly easy mathematical equation. First, measure the overall width of the wheel (remember, just because a wheel is 18x7.5, does not mean that the OVERALL width is 7.5”. It means that the measurement between the outboard flange and the inboard flange is 7.5”). Next, divide that width of the wheel by two; this will give you the centerline of the wheel.
Overall width/2 = Centerline
After determining the centerline, measure from the hub-mounting surface of the hub to the edge of the inboard flange (if the wheel were laying flat on the ground – face up – your measurement would be from the ground to the hub-mounting surface). This is your back spacing.
Back Spacing - Centerline = Offset in Inches
Inches x 25.4 = Offset in mm
Overall width/2 = Centerline
After determining the centerline, measure from the hub-mounting surface of the hub to the edge of the inboard flange (if the wheel were laying flat on the ground – face up – your measurement would be from the ground to the hub-mounting surface). This is your back spacing.
Back Spacing - Centerline = Offset in Inches
Inches x 25.4 = Offset in mm
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