A Casarva Trike Kit is a hand made kit that is used to convert a motorcycle to a tricycle so that a trike can be built at hone . All Do It Yourself (DIY) Casarva Trike Kits have independent Rear Suspension and can be fitted to shaft, belt and chain drive donor bikes.

https://www.casarva.co.uk/trike-builds-kits-sales-and-services/casarva-diy-trike-kits/