& a budget RD can be found with a built in hanger..
I happen to like my IGH better than the old derailleur bikes , but I Invested in Nice ones..
A 135 wide frame is a good fit for a Shimano Alfine 11 speed IGH...
3 speeds in typical trikes need a sprocket attached to the hub body, turning at a different rate than the crank driven cog ..
but you may find a 6 bolt cog to fit in place of a brake disc, in a hub, not in a wheel ,
to then drive the axle attached to the drive shaft with 1 of 2 wheels in back, powered..
....
Last edited by fietsbob; 06-12-19 at 11:02 AM.