There is no "touring group" per se.
The typical approach used by most manufacturers is to use a "moutain" rear wheel, cassette and derailleur (11-32), and a "road" triple crankset – 105 or Ultegra – with a road derailleur and STI levers. Two flaws of this practice:
- gears are too high and too spread apart for ideal use (25 to 127 gear-inches with 9 or 10 duplicates... and 3-4 gears that are way too high);
- STI levers are often matched with v-brakes using Travel-Agents... which tend to be cable eaters.
In my humble view, a better setup would be to use a mountain crankset (44-34-22 or something like that). A person could then either use a 11-27 cassette to build the bicycle for light touring or commuting or a 11-32 cassette to build a true tourer.
Then use either bar-end shifters (or downtube shifters), or use STI with cantilever brakes.