I wasn't referring to your private message kerf, but others who mention the same product and website after it's been posted in the thread 4 times already.
The jackshaft and derailleur kit is probably 10 bucks in parts or less and sells for $200. They are selling tiny sprockets on their site for 20 bucks when they sell for 1.50-3.00 everywhere else..
The interesting thing about their system is the freewheel that allows the pedals to be used. The engine can turn the bicycle chain without turning the pedals. Said you had a 49cc engine, what kind is it.
It came off a sit down scooter you might see at a wal-mart or k-mart. It's pretty much for kids cruising around their neighborhoods, and not a commuter vehicle.
It's dark outside so I'll scour it for some type of name tomorrow
I'm going to look for a 24 inch or smaller derailleur bike, but yeah, gear ratio was a problem but I figured I had my math right but was unsure because of how difficult it is to visualize gear ratio effects.
If I put the math here very clearly detailed, would anyone be willing to double check it?