I thought I would toss this out there for input.
Our Burley Rock N Roll is set up for road riding. It is currently sporting 9 speed 5500 STI 105. It works just fine. I love the bike and enjoy riding and working on it.
I have a new (take off) set of 5700 STI 10 speed shifters, derailleurs, and cassette(s) sitting on my bench. I'm trying to decide whether or not to swap it over to the tandem.
Minuses? I would be removing perfectly functional setup that I have pretty much dialed in right now. However, it dates from the 90s and while it is believed to be low mileage, it was used when I obtained it so there is an element of unknown there. Also, I would likely want to replace the cables, which I just replaced last spring.
On the plus side, I would be gaining 10+ years of technology along with another cog in the rear. In addition to that, the parts are essentially new. I also like the ergonomics of the 5700 vs the 5500. The shape of the shifters seems to feel better to my hands and wrists.
We ride less than 1000 miles/year. I would love for it to be more, but at this time that's just what it is. My stoker enjoys riding, but doesn't really love it. I, on the other hand, love it.
On the tandem we do mainly club rides in the 30-50 mile range, 15-16 mph avg on flat ground with a decent amount of climbing. We also ride an occasional metric. Compared to most of you folks here, we are just dabblers in the tandem world.
Would this just be change for the sake of change?