on the way to work today i heard this rubbing noise i never heard before. late and not wanting to stop i am looking at my back wheel without stopping. ten seconds in i see a clump of dirt (riding in the city) stuck between my wheel and my frame. as i am looking at it, it flies out and hits me in the face. a whiff later i discover it was dog ****e. just thought you guys could appreciate it. any advice will be laughed at. thanks.