Hmm… I know an average over a mile or so would be better, but I don’t have it right here.
However, today’s ride was pretty good, so I can use it:
15km in 53 min total, with a few lights, so moving time 51 minutes= 17.6km/h = 11.0mph
This still including curves and a few stops and so, plus 2 uphill sections of 1-2 minutes… and obviously my best single mile out of almost 10 miles should be a little higher than the 11mph, but only a little, so maybe 12mph?
This is on an ungeared 36 with 127mm cranks. I feel like I am getting pretty close to the max speed with 127s and am still waiting for my multi-hole cranks and/or also want to put the 100s back on (only had 2 commutes with the 100s). Thus, I think a good-effort mile right now with 127s would be something between 20km/h and 22 km/h (12.5mph-13.75mph).
I haven’t ridden 150s for a few months now, but I often ride 165s for Muni and I feel like I am way way slower as I can’t spin with the longer cranks (but I didn’t actually measure speeds).
If I remember right I think a while back I was getting max speeds between 18-20km/h with 150s, but this was more for short-term sustained, maybe a half mile or so: (11.25-12.5mph), so I think 12mph would be about my realistic one-mile max average with 150s.
After 1 year of 36, I have really great control with 127s (I successfully did a freemount after stopping in traffic for construction today, which I wouldn’t have tried even a month ago), so I think something between 110-117 should be my ideal length for my commute (as I said, I’m still not done with my drilling project, but 165/137/117/100 looks like what I am going to do: see drilling multi-hole cranks for easy pedal length options - #32 by MUCFreerider)