Not knowing much about hubs I figured I'd better post. Took my Trek tank out today and on the way back to the house noticed I couldn't coast or back pedal because the chain would just stop, and droop - complete slack. I had to keep pedaling to keep tension on it. When I got back and put the bike on the stand I noticed if I cycled the crank arms forward and then stopped them instead of coasting the arms kept rotating around. I'm assuming this is a bad hub or parts going bad inside.