I feel pretty stupid. I forgot to shift my chain to smallest sprocket in back and so after I changed tire and put wheel back on, the derailleurs are both off. The front one is rubbing badly. Took off the wheel shifted down to smallest back sprocket and put wheel back on with chain on smallest sprocket but everything is still messed up. IT also seems that my rear brakes are dragging and that i can't seem to get the wheel centered in the chainstays. Did I do something really wrong here?