Originally Posted by
suncruiser
. . . It's got a Crap shimano unmodel derailleur on it now, I think a TX50 or something like that. . .
What exactly is wrong with the derailleur? Any Shimano would likely be the best part of that bike.
What aspect of riding do you think will improve by swapping a single part? How much do you think it will improve? Will anyone be able to perceive such an improvement?