I'm 59 with a host of fun issues like bad knees that keep me from standing up much for power, a torn rotator cuff in both shoulders and I'm overweight at 220 (down from 278 last year because of riding). I ride a mtn bike with skinny tires in the summer on pavement but would really, really like to get a road bike just for the fun of moving a few mph faster. Due to other health issues I can ride strong aerobic speeds but it would be stupid for me to push my heart rate to the max so racing is never going to be important to me, even in an age-group setting. With that in mind, I have settled on a Specialized Roubaix triple. What I'm unsure about is the gearing. I don't want the Apex group. The 105 group doesn't go down far enough for me. I live among big hills and bigger mountains. Occasionally I use all of my mtn bike gears...and while I don't expect to get QUITE such low gears on a road bike, I really need something more than stock 105. I'd like to get something down in the area of 24 inches. I know that's absurd for a road bike but it is what it is and 95% of my rides are alone and I could care less if my cassette is silly. I'd prefer small chainrings with tighter clusters. My big ring is now 44 and I'm confident a 48 on a road bike would be fine but I'm unsure of how to best proceed if I'd like a new carbon fiber bike with what amounts to mtn bike gearing. I don't live in a place where I can find used bikes locally. What I am most interested in is recommendations for how to get the lowest gearing with the tightest cluster (I'll go a wide cluster if I have to) on a Specialized Roubaix. I think the standard 105 cluster might work if I could put a 26 tooth low on my chainring with a 27 rear that would sound great in terms of numbers. I could keep the stock 105 rear. Anyone know if a 26 inner chain is possible on a Roubaix and what would be involved in swapping the crank/chainrings? I will be working with an LBS but wanted some input here for a broader perspective. I'm fairly set on a 105 Roubaix triple. Hopefully this is stop-gap in the sense that when I hopefully drop another 20 or 30lbs I may be able to change gearing...but in terms of helping me get those lbs off I need gears for the hills with me as I am. Thoughts?