My front tire may have hit my rear tire. I was too busy watching the road and scenery to notice. For Randypower: I had to go to Eugene, Oregon to buy a lens cap for the same lens as before. Shutterbug is a great shop. I was riding with my camera sitting on my tank bag for easy access on the really curvy road. The strap was around my neck and the camera had slipped off the bag a couple of times, but the third time, my 10/22 lens detached itself and fell off. When I looked down and saw it gone, my heart sank lower than my stomach. Lens cap was not found. Polarized filter aluminum ring was found with no glass found. Lens itself looked OK but dirty. I went to Shutterbug and the lady there cleaned it, mounted a new polarized lens and lens cover and tested it. It worked. I am LUCKY.