Any rules of thumb as to when various component should be replaced? I just switched out the RX100 rear derail on my 91 Peugeot Success, not because of any specific problem but because i figured performance could be improved after 14 years.
The smoothness & crispness of shifting of the new 105 derail really surprised me. Any other parts that might well be replaced? (crank was replaced for a triple about 6 years ago). Stock rims were replaced with Mavic Reflex SUP after a collision that also led to replacing the fork with a Sakae Litage FX.