I agree with all the above posters that due to their size tandems are more stable machines in the wind than a single. On the other hand, with current popular tandem steering geometry tandems are much more likely to be destabilized by side to side weight shifts. Add to this the fact that some tandem teams have little experience in high wind on the tandem. As a result if a tandem, especially one moving slowly, is suddenly tilted by the wind then the bike will react in an unfamiliar manner which can result in more movement off their line than on a single where the rider is well acclimated and almost automatically adjusting for the wind.