I have been reading the threads on crank length theory and have not seen any direct reference to rpm. I have been riding a uni for 30+ years and racing bikes for 20+ years, and have just recently started to consider different crank length options for my unicycles which have 140s and 150s.
Obviously a uni has 1 to 1 gear ratio, which is about as low a gear I use for climbing while racing a mountain bike. For maximal efficiency 90 to 110 rpms is my optimal aerobic range, and max power is obtained between 140 and 160 rpm. At 6’1" I prefer 177.5mm cranks for road and moutain bikes and 172.5mm for fixed gear or track bikes.
I can’t see myself buzzing around on my uni at 100+ rpm for any significant distance, which is my comfort zone on bike.
What kind of rpm are some you guys spinning, and for what kind of riding?
I think maximal efficiency for a particular RPM depends on your crank length- I would not feel very efficient trying to spin a set of 170’s at 140rpm, but I regularly spin 140rpm on 100mm cranks without too much effort. Your comfort zone/aerobic threshold is definitely crank length dependent.