I can show you how to convert a Razor E300 Scooter, I suggest you buy from Amazon.com should be about $250, into your very own Rehab Handicapped scooter. The E300 Scooter you will receive has only one speed. High Speed, or coast, nothing in between. It is made for some one 13 years old or older that weights less than 220#. With my modifications it can go as slow as you need to go, and up to 12mph for a couple of miles. This all depends on your weight. I weight 275# and I can ride my wife's scooter for a couple miles on fairly level ground. If you need to climb up steeper hills you can change some parts and increase the torque and decrease the top speed.
My wife has major back trouble. She can't walk very far. She has an big Invacare scooter, but it is so big and heavy she has trouble getting it out the van with ramps. But this scooter is only 55#, and easy to get in and out of her van, by herself. I built one for her, and it was so popular I had to make more for my friends. The problem is you can't sell this scooter due to the liability issues, and I can't afford to give any more away.
The scooter is great for a person rehabbing from leg troubles, or other non life threatening troubles. It is good for camp ground transportation. Riding around flee markets. Or just riding for fun.
This video above shows my grandchildren, wife, and my self riding various models. The scooter comes in Gray or Pink.
Check out the manufactures web site for detailed information