My apartment complex had 30+ abandoned bikes attached to the garage bike rack. The land lord got fed up and after several warnings tossed most of them. I dumpster dived a brand new "Timberline ltd Triple Triangle" that only needed a quick release thingy for the front tire. Took that off another bike. I adjusted everything, shifts good. But I cant understand why the chain hits the frame when I coast. I fooled with the "b-screw" (I think thats what its called). It seems to create tension on the Derailleur as it extends. But whether its loose or tight the chain still hits the frame. The chain is brand new. But could it be too long? do I need to lube something? Another noob question. The front tire spins forever if I turn it. But the back one with the ticking sprocket slows down fast, as if it needs lube or somethings too tight. Should the rear wheel with sprocket spin as freely as the front?