I was outside last night practicing skidding on the Rush Hour for the first time, and I started to feel some slippage in the rear hub. This morning, riding to work, I had a few more slips, so I took it to my LBS, and had everything all tightened up. A few metal filings, but I didn't strip the hub completely. IF YOU HAVE A RUSH HOUR, GET YOUR LOCKRING TIGHTENED.