Mine sits outside about 50% of the time and other than cleaning the snow off of it I've only had one problem. I left it with the front wheels directly under an overflowing gutter on a night that turned cold. The next day it started to vibrate at about 40 mph. The freezing water from the gutter had formed ice covers on some of the wheel spokes unbalancing the front wheels. It stayed inside the next night and the problem (and the ice) went away.