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As aliasalias said it's just spinning faster. So if anything you could use the less powerful variant (SD-8 I think) which is slightly lighter and has slightly less drag. Small wheel variants are probably in the same vein (or are actually SD-8). But otherwise PD-8 should be fine if you have one already.
cgg
Is using an SP PD-8 on a 20" wheel likely to cause issues? I note that they do a small wheel version, but I don't already own it.