Hi Dave .

Welcome to the forum from the UK


The ideal place depends on the rider - where is the most comfortable for them and of course where they can get most force for little effort .
The other concern is the seat because the legs do provide a little help in "staying put " whilst cycling.
IIRC there is one somewhere on the forum .




Here is a tadpole design for a chap that cannot ride a bike due to balance problems
http://www.halleebridgeman.com/autis...tadpole-trike/


regards from the UK

emma