There was a great blend of bikes at this years SF Bike Expo. They had the Cycle Cross guys riding right along side of the MTB Track, and the BMX / Fixed Course. The guys on the Mountain Bikes blew my mind with their backflip variations. laying down double backflips, backflip tailwhips, and backflip no handers to late barspins. How do they do it. I managed to pop off a few decent shots of some of the riders getting lifted.