My touring gear was 52-42 and 12-34 5 speed freewheel (real old school). I was mid weight loaded (35 pound net load on a 30 pound bike (racks & panniers but no front fork panniers). All up (bike + me) weighed in at a tad under 220. What I discovered was that speed was dangerous, particularly speeds over 25 mph. The bike was a French touring bike with a very raked front fork and "flexible" frame, which is to say it was (still is) smooth riding but noodly. But gear on the back & front (front bag) meant the load could wag the dog if any oscillation came in (road imperfections, braking, out of true wheel, loose head set) and was a problem above 25 mph and definitely above 30 mph. My whole point in this is that tour gearing really depends if your "cafe touring" like a randoneur or loaded touring like a backpacker. Possibly more important for a C & V bike in that modern bikes don't have crazy rake and frames can be stiffer. I rode 4k miles with the above, never wallked a single hill, but learned to coast easy down big hills and avoid speed. Since few of us are professional tourists, I'd suggest gears that keep you cruising in the 11-12 mph range with climbing gears at 4-5 mph and tail wind gears at 15-17 mph. Cadence of around 75 rpm. IMHO. If your a randoneur...well that's less weight, more choices.

This calculator http://www.machars.net/bikecalc.htm helps on figuring out speed and cadence.