Been lurking on the ss board for a few months now. I had a 70's Raleigh 10 speed converted to fixed about 4 months ago and have been loving it. Until this past Sunday, that is, when one of the screws attaching the chain ring to the pedal arm popped, and the chain jumped off. This while making a maneuver to get around a left turning car. Luckily, the driver and I made eye contact and I was going slow enough to avoid a catastrophic accident. Brakes are good when you need them. I feel lucky nothing happened, but I have greater respect for the forces involved in the drivetrain.