Ride On Toys & Vehicles
TRICYCLE REAR CENTRE DRIVE HUB INTERMEDIATE HUB SUIT SCHWINN MERIDIAN AND MOST BRANDS OF TRIKES GREAT TO BUILD OWN TRIKE
This hub secures in the trike/bike frame drop outs and has thread either side for securing a band brake to the left and a multispeed sprocket (or single freewheel if cog spacer is removed) to the right, which is then hooked up to the trike chainset....
https://www.bizrate.co.uk/rideontoys_vehicles/tricycle-rear-centre-drive-hub-oid12198041808.html