Is there a front derailleur that will throw to a chainwheel around 50mm from the seat tube (or a way of adopting an existing one). I have fitted a bottom bracket motor to a hybrid and the supplied chainwheel is shaped to overcome the projection of the motor.
Fitting a further chainwheel, the supplied spider is a 110 BCD, gives an offset akin to a triple chainwheel albeit with the centre chainwheel missing with the extra chainwheel around 50mm from the seat tube.
My front derailleur, a Shimano Tourney FX51 for a triple chainwheel, does not have enough throw - the outside of the cage is in line with the teeth of the extra chainwheel at full throw.
Fitting a further chainwheel, the supplied spider is a 110 BCD, gives an offset akin to a triple chainwheel albeit with the centre chainwheel missing with the extra chainwheel around 50mm from the seat tube.
My front derailleur, a Shimano Tourney FX51 for a triple chainwheel, does not have enough throw - the outside of the cage is in line with the teeth of the extra chainwheel at full throw.