The problem with nail polish or rattle-can clear lacquer is that without an etching primer to passivate the metal surface and provide a good bonding surface for paint, the clear will start flaking off in no time and look really bad. In places where it does stay on, sealing in moisture and other oxidizing agents will let the spokes continue to rust under the clear.

The wax suggestions are the optimal solution. Relatively cheap, easy to apply, easy to maintain, and won't degrade the appearance. As surface rust continues to pop up (and it will, but more gradually) you can just scrub it off with some steel wool and re-apply the wax.