Any question answered...

Find some sports science students at your local uni. Part of their course is to measure VO2/power, I did a couple a few years ago. Amusing to compare the rugby players to cyclists. The rugby players were struggling to keep cadence up at 60rpm whereas the cyclists struggled to keep it down at 60rpm. The guy made a few ramp tests at different rpm which was useful for us.

Good shout, I'm sure i know someone doing sport science as well... now just to remember who.

do i need a 5 speed or a six speed freewheel for dropouts spaced at 124 mm?

either.