It might be a stretch for the assignment, but i felt it fits.
I know this bike has seen it's fair share of miles. It's worn discs show it's distance traveled deep in it's grooves.

volks, I like the concept and execution of your photograph very much. It really captures the texture of the metal.

I don't think it is a stretch at all, nice entry. Looks like it is time for new rotors!

Great detail showing lots of travel. Nice.