I recently crashed going downhill. This hill has residential speed humps, and usually I fly over them with no problems. I was standing on the cranks as I went over the last of them, but as my rear wheel touched back down on the normal pavement it locked up. And I, standing and probably with my hands not gripping the bar, took a bad slide after the tire skidded the bike away from me.
After I stopped sliding I remember thinking that God himself must have come down and squeezed my brake, because that was the most random, non-sensical event ever. I tried to understand what went wrong as I picked my bike up and limped home, but instead of finding the brakes locked or the wheel out of the stays, it was fine. It rolled fine and thankfully, I guess, showed no signs of anything wrong.
So what the hell happened? I went over a hump in the road, and as the rear wheel completed the hump it locked up, causing me to skid out of control at 25 MPH or something.
My ONLY guess is that the rear brakes caused it, because earlier in the day I had increased the tension so I wasn't pulling the brake lever on my bars against the tape on hard brakes. But how does increased tension correlate with the brakes suddenly grabbing? I know they sit closer to the rims while under more tension, but honestly, I had a completely normal and symptomless ride. I had even gone over two humps on the same hill without any problems. Then on the last one, BAM.
Any clue what happened?