I got this twist shifter to replace the front triple trigger shifter on my daughters first full size mountain bike. The bike is the smallest possible at 13" frame but all components are designed for adults. As she's small she found the trigger shift just too hard for the non-indexed front shifter.
I just replaced the trigger shifter with the Shimano RevoShift and purchased a small 2/3 grip from another well known online retailer specialising in bike components. I Kept the original 3 speed front derailleur as is. So I think the revo shift should swap into any standard front 3 speed setup without any messing with the front derailleur.