In article ,
John Doe wrote:

Specifically, where can I buy a high quality small wheel hub motor
(with wheel) like the one used for powered Trikkes?

http://www.trikke.com/hd_2/Refurbish...-E-Kit-Upgrade

http://www.trikke.com/CU_frontwheel.jpg

Or some other small wheel (16 inches or less) hub motor?

Thanks.

You can buy **** almost anywhere, but if you want the best, there's only
one company.

http://www.heinzmann.de/en