I just bought a used Tracer frame for my wife with the original LX Mega 9 Front der on it. the cranks I put on are Bontranger race Lite 22-32-44. The problem is my chain rubs the bottom of the the derail in the low position in and I cannot put the derail any lower on the frame because it won't clear my 44 t chainring when I shift up. Derail works fine otherwise. Any thoughts? Thanks for the help.