had a chain come off at full sprint, 35+ MPH, and went over the front and slid, and slid, and slid. Lesson = don't skimp on maintenance, a stretched out chain replacement is cheap compared to you're entire side being turned into Hamburger.

Also got hit by a car at night, crossed in front of me and I plowed into it at 20mph, separated shoulder. My suggestion is do not ride at night at all, maybe with a very powerful light but even then.......