We went riding today with a friend who has a fairly new CF bike. (I believe from looking at the graphics that the brand name must be "
TREK TREK TREK TREK TREK TREK TREK" and the wheels are
Bontrager Bontrager Bontrager Bontrager". I think it had a model name but I wasn't able to read it.) I noticed his rear wheel had a DD, a little, small one made of plastic.