The only crash we've ever had at a speed of more than 1-2 mph, was the first day we went tandem shopping. We were demoing bikes and there was a light rain falling. At the end a ride, we went up the little concrete ramp from the street to the sidewalk in front of the store and the front wheel went right out from under us. I'm assumed that it hydroplaned. We were doing maybe 7 mph, however, we went down pretty hard. My wife scraped her cheek and thigh, I wrenched my back-but of course didn't notice until a day or two later. We did buy a bike, but not the one that we crashed.