If he was using 4 IRS rims (4 rims all with the same offset, for IRS machine) then you would need spacers for the rear, to get them out to the same width as the front. That's probably what he meant by needing spacers.
If you call MudThrowers, and tell them what bike you have, they can direct you with what offset wheels will be needed. They are very knowledgeable. Especially when it comes to brutes.
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