Clark W. Griswold
Join Date: Mar 2014
Location: ,location, location
Posts: 13,813
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
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A recumbent tadpole trike would be the best solution. An upright trike is less stable and training wheels by and large are for parents who don't understand how to balance and force their kids into the same. There are some I have seen for older kids with developmental delays but nothing I can recall that I would put on a 3 speed SA hub and have it work well.