Measuring wheel offset involves determining the distance between the wheel's mounting surface and its centerline. Here's how to do it:
The video snippet describes a method for finding the centerline of the wheel, which is a key step to calculating offset. While the video excerpt doesn't fully detail the entire offset measurement process, it implies this critical element:
- Measure from the floor to a straight edge placed across the wheel's rim. This measurement will be used to determine the center line of the wheel's width. The example given is 244 mm.
To fully measure wheel offset, you'll need to supplement this with information about the wheel's overall width. Here's the complete process:
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Determine the Wheel's Overall Width: This is the distance from the outer edge of one flange of the wheel to the outer edge of the opposite flange.
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Find the Wheel's Centerline: Divide the overall width by two. This is the location of the wheel's centerline. In the video excerpt the centerline is determined by measuring from the floor to the wheel.
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Measure Backspacing: Backspacing is the distance from the wheel's mounting surface to the inner edge of the wheel.
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Calculate Offset: Offset = Backspacing - (Overall Width / 2).
- Positive Offset: The wheel's mounting surface is closer to the outside edge of the wheel.
- Negative Offset: The wheel's mounting surface is closer to the inside edge of the wheel.
- Zero Offset: The wheel's mounting surface is exactly in line with the wheel's centerline.
Example:
Let's say:
- Overall Wheel Width = 200mm
- Backspacing = 120mm
Offset = 120mm - (200mm / 2) = 120mm - 100mm = +20mm (Positive Offset)
In summary, measure the wheel's width, calculate its centerline, measure the backspacing, and then subtract half the wheel width from the backspacing to determine the offset. The video excerpt demonstrates a starting point for finding that centerline.
