there will be definate step down on the threading of the hub if it is threaded for a fixed sproket.
despite what some numpties might say, only used a hub that has this threading for riding fixed and you definately need to fit a lockring. if you dont she will loose her teeth, simple as.
i would recomend fitting either the same gearing or going to 19 sprocket as the effort of leg breaking and pedalling the whole time will initially but quite tough on someone used to freewheeling and brakes.
as far as positioning in the dropouts, this can be sorted out by adding or subtracting chain links as appropriate.
there will be definate step down on the threading of the hub if it is threaded for a fixed sproket.
despite what some numpties might say, only used a hub that has this threading for riding fixed and you definately need to fit a lockring. if you dont she will loose her teeth, simple as.
i would recomend fitting either the same gearing or going to 19 sprocket as the effort of leg breaking and pedalling the whole time will initially but quite tough on someone used to freewheeling and brakes.
as far as positioning in the dropouts, this can be sorted out by adding or subtracting chain links as appropriate.