We have been testing our own transmission design with what we believe to be "Great success". It is chain/sprocket drive and utilizes a Max Torque centrifugal clutch. w/ current reduction and standard 44 tooth final drive it produces a top speed of 34 mph. Reduction can be changed w/ off the shelf parts as well as final drive sprockets. It is narrower than the Hoot and Grubee as a prototype and will be even narrower in production. All metal in construction, w/ aluminum covers, it will prove to accent the look of vintage style bikes as well as new models. It is set to go into production in the next couple of weeks w/ availability beginning (most likely) in late April. Transmissions will be available in a complete kit or seperately (for those who already own a kit w/ an inferior transmission) and will be available for models w/ 15mm, 5/8", or 3/4" shafts. Retail price will depend entirely on production costs but it is our intention to keep quality and appearance high and price low! The kit will come w/ a "real" universal engine mount that will also look nice. The current pics are of the prototype (built for functionality only) and the finished product will be cnc precision machined to a more rounded shape reminiscent of vintage single cylinder motorcycles. I'll post pics of the finished product as soon as I can! I'm confident that it's appearance and funcionality will appeal to the asthetically minded m/b builder. As always "Motorized Bicycles and Accessories Built for the Real World"