Thanks Jur.

I was reading an article which said "your body selects the cadence" and I think that makes sense. When a rider gears their singlespeed to their terrain and ability, they will naturally gravitate to their natural cadence using that gear.

I often find my rhythm "between gears" working with derailleurs whereas on my singlespeed at 62 or 66 I accelerate until I hit my happy cadence and work hard to sustain it. I guess that is the zen of singlespeed. The hills are a harder effort no doubt, but EVERYTHING else such as cornering, accelerating out of a corner, accelerating downhill on the flats is all simpler with a singlespeed.