Electric motor with disc and V-brake
The frame is made from aluminium, and the Rio Firefly wheelchair attachment has a 140-mm disc brake and a Promax V-brake. It has a 12.5-inch wheel with a tire that is 2.25-inches wide to provide good grip on slippery surfaces such as wet grass or leaves.
The total weight of the Rio Firefly wheelchair attachment is just 10.9-kg with the battery included, and it can be used by a person weighing up to 115-kg.
It is a convenient, light-weight option which may not have such a slick look as others, and the docking system may not be as good, but it does have a more accessible price tag.