noise only from the NDS, on my single speed. loud as crap, it's not the toe clip and it's only when the left pedal has pressure on it (if I take my foot off of it nothing). Haven't had time to put it on the stand yet, but was hoping for a general idea of where to start. I pulled over and tried to locate the issue but couldn't

semi related: what's the best way to know if the bearings in a pedal are shot?