What we have here is maybe the most unusual set-up of any bike I have a pic of. What looks like a single speed with a derailleur providing chain tension, is actually a 14 speed, thanks to the amazing Rohloff Speedhub 500/14. The Speedhub features 14 internal gears operated by a twist shifter. It's hella expensive, but it's mostly worth it, as it is sealed and aparently rolls pretty smoothly.
The shock provides 2.4 inches of travel and uses a 1 1/4" headtube with a standard size 1 1/8" stem. Why couldn't Cannondale engineer that?