Riding the fixed gear. Talk about an ouch! I made contact with the stem with a very sensitivee area of my anatomy and have no idea how I avoided a faceplant! Chain ring came off the crank and I basically dropped the chain and went from a sprint to recovery in an instant. I will say my voice was higher pitched than Geddy Lee's singing voice while I was cussing a blue streak! :p.
How much force does it take to shear track chainring bolts and mount hubs?