I am considering building a winter commuter (possibly Pompetamine). Ideally from a cost perspective I'd single speed it. Ideally my legs would prefer an Alfine hub - as I am fat and unfit.
Commute is 17 miles, mostly quite flat but there are some short hills. Most days I would commute one way only (and go by train the other way).
Google seems to suggest that 32:18 is a common starting point for single speed. My road bike's smallest chainring is 39, so would running 39:21 give a reasonable idea of the pain I will suffer on this? Something tells me crank length and tire diameter have an impact too - but are they small enough to ignore?
I don't want to buy this and discover I can't ride it for its main purpose.