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Thread: how do i work out offset?

  1. #1
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    i know iv seen it on here before but cant find it now. the wheels im looking at are 15x7 and the back of the rim hub to the back of the rim is aproximatley 145 mm. would these fit?
    [attachment=14673:attachment]

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    Offset is the distance from the centre of the wheel to the mounting surface.

    Going by your figures offset if roughly 45mm, and would not fit.

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    thanks i wont be buying those rims then

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    I remember looking this up ages ago, so here's an overly-complicated wikipedia answer, for future reference.

    "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 from outboard flange to 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 mounting pad 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 mounting pad). This is your back spacing.


    Centerline – Back Spacing = Offset in Inches


    Inches x 25.4 = Offset in mm"

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