i have a trek 4300 and i want to lower my handle bars if possible. is there anyway i can do so without buying a new part, if so where could i get the part.
also, i know im gonna kill this one, but my deraileur doesnt allow me to switch into my 8th gear, and it gets pretty lose and wobly in 7th and a little in 6th. also when im in first gear my chain rubs on my front deraileur. does anyone know how to fix this and could explain it to me so i dont have to take it into the shop?

did i spell deraileur right?