Well, at least the top 3 reasons that came to mind after this evening's ride up Dry Creek and down Bobsled (starting and ending from the office):
1. Counterintuitive as it may be, climbing can actually be easier on a rigid single speed compared to suspension and gears (this is a manifestation of the "magic" of my single speed that I can't quite figure out). Case in point being the switchback at the top of Dry Creek and the subsequent 100 yards of trail and The Wall. I had my doubts that I'd be able to get up either of them with 1 gear but somehow I made both.
2. It's fun to say "On your left" as you pass a guy riding a geared bike while climbing The Wall.
3. Dropping into the Bobsled on a fully rigid single speed after nodding to the two downhillers resting on the bench.
Massive Loss of North Cascades Glacial Ice This Summer - Foss Glacier, North Cascades, Summer 2015. Source: http://blogs.agu.org/fromaglaciersperspective/2015/08/20/disastrous-year-for-north-cascade-glacier-mass-...
10 hours ago