This bike has been a background project for a few years now. It started as a very used Trek 820 mountain bike and an even more used xtracycle cargo bike extension. The most unique thing about this bike is that the "StokeMonkey" drive system is right side drive and fully freewheeled so that the motor and pedals can each spin independently of each other. On traditional StokeMonkey systems, the motor drives the left side of a crank like a tandem rider would. So when it moves the pedals, you need to pedal with it. These systems would typically have a freewheel on the motor so that you could pedal without having to also turn the motor. A side benefit of keeping the pedals completely independent from the motor is that I could implement a torque sensing bottom bracket - which I did.

I created the right-side independent drive by using a White Industries crank freewheel putting a reverse ratcheting ACS "SouthPaw" freewheel on the Crystalyte drive motor. In order to mount the SouthPaw, I had tor replace the normal freewheel threads on the motor and replace them with some left-handed threads. I did this by literally sawing the threads off with a hacksaw and then carefully filing resulting surface flat with a file. I then bolted and bonded a right side bearing cup from a bottom bracket to that surface. It is a fortunate coincidence that bottom bracket threads are the same as for freewheels. Or if not exactly the same, very, very close.

This last picture is a proof of concept mockup before any of the parts were stripped and repainted. I decided to just remake the wood deck rather than refinish it. You can see that the original plan was to have the motor in the rear triangle - and I would have preferred that. But I was uncomfortable with the tight fit. Some of the gaps were pretty small. And moving the motor did free up that area for mounting the battery, motor controller and 12v DC converter.