I ride a fixed-gear bicycle. Earlier tonight while I attempted a skid, it felt as if the drivetrain skipped a beat and gave out on me. I put resistance on the forward motion and it felt as if it just gave way for a moment. I rode it for a few more minutes and when I start from a stop and mount onto the bicycle, the drivetrain will just skip or slip for a moment until I start moving forward. Something must be loose or stripped, but I am not sure where to start or look. I'll probably be going to the LBS in the morning to get it checked out, but maybe you guys could help pinpoint or narrow down the possibilities as to what might be wrong. Any help would be greatly appreciated, thanks.