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Murray, the 4 x 4 1/4 is the bolt spacing you need. It is only .050" off of a 4x108mm. In other words, they are interchangeable. If you have determined that you need 25-30mm offset, then you may not want as much as 4 7/8" backspacing. That backspacing works out to more like 35mm of offset. With zero offset, a 7" wheel would have 3.5" to the outside of the hub face and 3.5" to the inside. The difference between the 2 values (4 7/8" and 3 1/2") is your offset. In this case it is 1 3/8" or about 34.9mm. If the backspacing was measured all the way to the outside lip instead of the bead seat, then the offset is probably a little less. Either way, as I mentioned yesterday, you can always use a 1/4" (or larger) spacer to gain clearance on the inside!
Erik
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