Are you saying that you have a flip flop wheel and have a block on it, if so then how many speed? Someone who knows will be along in a mo but I've always assumed that those are for two fixed sprockets or one fixed and one freewheel.Davis_XI":1qf9mhtl said:Would anyone know if a flip-flop hub would have the same spacing on both sides. Wondering if I've put the hub back on the wrong side?