The Spanish company Batec offers wheelchair users a 2 in 1 approach. First, people can cruise the streets and sidewalks at variable speeds. Second, people can quickly and easily disconnect from the Batec, leaving a fully functioning manual wheelchair. Go on bike rides with friends, then jump into a restaurant for a bite to eat!
Batec takes the weight off the front casters and the electric models provide good power for people who are not quite ready for a power chair yet.
In Canada, you can buy Batec from 49 Bespoke.