The B&W conversion looks decent... a good amount of contrast but the subject seems confusing. If you're subject is supposed to be the pedals (as your title states) you don't actually see the pedals. If it's supposed to be the gears, then I think you could've cropped the shot a lot tighter to focus on the gears.
Closest to the lens is the crank arm. That's attached to the bottom bracket, which is inside the bottom bracket shell, which is part of the frame. The gears on the other side are called "chainrings."