Was at the $tealer today, and struck up a conversation with the parts man. He went zipping thru the ETK and pulled up the following list weights for the Style 87 (4.6) and Style 168 (4.8) wheels;

The following weights are for the rears, 20 x 10.5

4.6 Style 87 14.3 kilo 31.5 lb
4.8 Style 168 12.2 kilo 26.9 lb

These weights seem closest to what my gut says--the five-spoke versions are pretty 'beefy' (substantial) and so it makes sense they're slightly heavier--but not by a large degree.

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'05 4.8is Sapphire Black