I'm pretty sure the spokes are either stainless or satin chrome, not originally painted. Be sure to try polishing the finish back to original look before resorting to paint. Mine looks great with just polishing.

In the case of chrome plating, you can make light rust disappear with extra polishing. Pick one small area, hand polish with chrome polish for about 5 minutes, and watch carefully if the rust is decreasing. If so, you might be able to get all the rust off. It's as though some of the iron molecules got on top of the chrome, but they can be wiped off with extra polishing. Polishing rust off chrome will take some time and elbow grease, but it works!

I got all the rust off my gear shift lever by polishing. Took maybe 1 hour of work. This didn't work for my exhaust tips - they were too far gone and pitted.