The front-bike-rider (the “captain”) should be a reasonably competent rider if your passenger (the “stoker”) is a wiggly-type. It helps if the stoker has had some experience riding bicycles on their own. It’s also one-speed that the stoker weighs less than 85 lbs and the captain weighs more than 150 lbs.
This is an add-on to our rental bikes. We may be able to attach it to your own bike if you like, just please bring it in so we can assess suitability and safety, and so we can install the seat post hitch.