Installing the crank chain
The two freewheel sprockets they will turn based upon the fastest rotating sprocket. The outer gear of the slower sprocket does not necessarily turn. So we replace the axle single crank sprocket with two freewheel sprockets with one lined up with the pedal chain gear and other lined up with the mid drive motor. As such, the crank has a chain fitted between the crank gear and a 3" freewheel sprocket on the drive axle. Our tricycle in this case has a 16 tooth 3" freewheel sprocket on the axle lined up with the main gear of the crank pedal assembly. It uses a 1/2" chain and a 3" 16 tooth freewheel sprocket again designed for 1/2" chains.A chain break is used to open the chain. The chain is then shortened such that it rounds the Chain gear and sprocket. We allow 1/2" slack in the chain and place a chain link for 1/2" chains to rejoin the ends. The chain for the axle to drive wheel is a 3/8's chain and has a 15 tooth 3" sprocket fitted to the outer end of the drive sprocket. This sprocket must line up with the selected gear at the rear wheel. There are 7 sprocket in the rear wheel cassette. Larger gears will drive the trike slower and smaller gears will drive faster. It is put on in a similar fashion to the previous chain but using a 3/8's chain link. Last thing to do is place the chain guard in place to complete the installation.
The final hurrah! I have a ridable trike ready for conversion to a fully electric unit.