Ok.. so I just bought a couple bikes for my wife and I cuz she has decided she wants to exercise and doesn't like jogging five to seven miles a day with me. So I went out and bought a Marin Alpine Trail and it definitely needs a new chain but don't even know where to begin. Other than that the bike only says edge x and 7005 on it and am understanding that only deals with the frame. I know it has a nice 3 piece crank and presume 9 gears. Just trying to find more info on bike and some pointers for setting it up for mud and dirt trails. Any help would be much appreciated as the net hasn't helped any. Lol.