Hey all. I noticed this creaking sound coming from my bike like 2 days ago. I don't know much about bikes, but it seems that every time I pedal, something makes a creaking noise. I think its coming from either the pedals, the gears, or something connected with that. Anyone have any tips on how I can figure out what's wrong? If I pedal slower, the creaking is just lower volume. I tried pedaling stationary, pedaling backwards, and I don't hear it. I also tried pedaling forward using my hands, with the rear wheel lifted, and I don't hear it either. It seems to only occur when I apply weight to the pedals. What could it be? Oil?