I was watching a show on The national geographic channel about high speed trains. One of the segments was about how the trains have to lean into the corners to be able to maintain their speed. They demonstrated how leaning helps by sitting in two different types of bike sidecars. the first was the traditional type, straight upright through the corners. The second one was interesting because the bike and sidecar were built to lean. the bike and sidecar were connected together in such a way that they both leaned together. It was very cool. it was a short segment and I couldn't tell what kind of bike it was.