I couldn't read the label on your link photo and haven't gone out to look at my bike but I am pretty certain you have the same Mirage RD I've got. Mine's shifted with top of DT mounted Superbe and is the smoothest shifting RD I've ever had and as positive as the best of the SunTours. For a (once) 52-42-28, (now) 50-38-24 triple by 9-speed to 28 teeth, a keeper. Stays on that best bike 'til it dies.

Nice bike! Strikes me as being in the vein of some of the best of the Japanese sport bikes. A sweet ride ready to go anywhere. (The Ti Cycles the Mirage sits on is inspired by those bikes.) It looks like you have much more tire clearance than I've got. I asked for clearance for just 28c and fenders and I have to cut long ovals in the rear fender at the seat tube (I like my rear wheels as far forward as I can get them; otherwise they bounce on fast downhill corners because I tend to pull my weight forward). So off road your bike would rule but on pavement, buddies. Steel and ti buddies. Bound by their elegant steel forks.