Originally Posted by
Road Fan
Bob,
If you post or PM me your freewheel tooth counts, I can do the math; I have an Excel spreadsheet set up for it. I can also design a HS gearing for you if you want to try an optimized one, since you have a supply of chainrings and cogs. I'd like to try it, but I don't have much in spare parts. Local flippers have all the decent used bikes, and they get out at 8 am to get'em.
Same offer to the Forum!
Road Fan
If anyone wants to experiment with regearing, I have some spare 144mm chainrings I'll probably never use, as well as lots of SunTour cogs. The classic half-step combinations which work out nicely include:
3-tooth drop (e.g. 49-46) / 2-tooth drop (e.g. 14-16-18-20-23)
4-tooth drop (e.g. 52-48) / 3-tooth drop (e.g. 14-16-19-22-26)
5-tooth drop (e.g. 52-47) / 3-4-tooth drop (e.g. 13-16-19-23-28)
6-tooth drop (e.g. 54-48) / 4-tooth drop (e.g. 14-18-22-28-34)
I am pleased to see so many devotees of half-step and half-step-plus-granny, even though the industry has completely abandoned us by making the new spiders so thick that the chain will ride up on the teeth of half-step rings. I tried building a 53-50-39 HSG with a 1990s Campagnolo Veloce spider and my long stackbolts, but the chain skidded too easily between the two outer rings. I settled instead for a less satisfactory but still kind of amusing 1.5-step-plus-half-step 50-42-39 setup, which I had to abandon when the
left crank broke because of Campagnolo's change in its spindle diameters.