We provide some of the mostreliable and robust electric conversion kits. The value of our products and service is in our ability to transform your ordinary bicycles into a reliable, thrilling and environmentally friendly form of transportation. We are currently seeing sine wave development of hub motor controllers, and of course battery technology is an ongoing proposition. Happy Bottom Bikes an our associates stay abreast of the latest developments in the E-bike industry in order to provide the very best in products. We have recently ventured into the development and manufacturing of bike frames designed specifically to adapt to our motors, controllers and batteries, and can be viewed on our web site at http://CargoBikeKing.com Certainly feel free to call us with your questions, and let us help you rediscover the joys of cycling in the 21st century. Cheers, Lennart