A wheel's backspace, or backspacing, is a term that mechanics use to describe its configuration. It measures how much distance separates the wheel's inboard flange from the surface that mounts onto the hub. Catalogues do not usually specify a wheel's backspacing. Instead, the wheel's specifications include its "offset." The wheel's offset is the difference between its backspacing and its centerline, which is half the wheel's width. Use the relationship between these measurements to derive the backspace from the offset.
Instructions
- 1
Measure the total width of one wheel.
2Divide your answer by two. For example, if the wheel measures 12 inches, you would divide 12 by two to get six (12/2=6).
3Add your answer to the wheel's offset. For example, if the wheel has an offset of -1, you would add: 6 + (-1) = 5 inches of backspacing.
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