Sturmey Archer S2C/S2

I've use and ridden the S2C, already had a wheel build with it if you want to try it on your bike.

All I can says is that the coaster on the S2C work a lots better than the others which often have poor modulation after a while, but the S2C bite really well and the change required slightly more effort than the old torpedo hubs (a slight tap is enough), but still work perfectly well.

the S2C hubs is worth getting, it will take a while for you to get used to it but after that it's perfectly fine.

if you want the top range to have 67GI (average for a singlespeed/fixed wheel bicycle), you'd need something like 50GI on the lower range.

kind offer ed. but you'd never get it back I fear!

figuring the gearing did my head in but I got there in the end. I think. I'm thinking of 42 x 20 (ish) with 700c wheel 28mm tyre giving 56" in direct drive. Only downside is 42 x 18+ means a new chain. Current one isn't long enough, but that is how OTP bikes work I guess.

Oddly enough 56" is almost exactly the gearing on my Strida (a bizarre looking but otherwise rather nifty folder I ride every day) and I know what hills I can get up on that; given you can't honk on a Strida I'm guessing steeper stuff will be doable with the S2C whilst out of the saddle.