krobinson102, There's no easy answer to your question. Often new, or even just properly adjusted kit will functon better. When I crashed out my STX-RC shifters on my mountain bike (8S) I replaced them with XT (8S) shifters. The XT shifters shift more quickly due to slightly shorter levers, the shifter body was slightly smaller as well. Otherwise not so different. Shimano trickle-downs it's technology so newer mid level group parts are as good, or better, than older higher level group parts. I've had Alivio through XTR RDs and functionally they're much the same WRT performance and longevity. There is a noticeable difference in finish and weight, however.

My touring bike is running 18 year old Alivio and Acera level kit and doing just fine. Bottom line in my mind is if one's racing for trophys, LX/XT and for money XT/XTR.


Brad