I was riding singlespeed tonight, and heard a loud clunking type sound from the back wheel area. Could that be the freewheel not engaging? Funny someone else just posted a similar question. It happened once or twice when I was really pedalling hard and pounding the pedals, and once when I was doing that and hit a pothole. Guessing the way to fix this is to get a white industries freewheel? (or just ride fixed lol).

Dave