Answer: I spoke with veteran motorcycle team manager/tuner Rob Muzzy, who used the PM (Performance Machine) solid disc wheels for a couple of seasons in AMA Superbike (see photo) but used spoked wheels both before and after. Muzzy says his riders never commented on crosswind behavior with regard to the disc wheels, so he concluded that they weren't a problem. Riders, he recalled, did not say, "Oh, those spoked wheels are much better." They, in fact, didn't say anything either way. Muzzy did say, however, that, as bike got more aerodynamic, "there were some comments that they became more sensitive to side winds."