At about 50.0 miles I did. As it's still under warranty from the shop I got it at, they pulled the bottom bracket apart and greased everything. No issues at 100 miles thus far. They eluded to the fact that it's a common issue. I'm guessing it might be the fact that it's a factory assembly so who knows how well it's really greased or tightened down. I really love this bike, I work a lot so I don't get to ride nearly as much as I want. I'd prefer that 100 miles to be 1000. So are you a chemist as your name implies?