So to get the 19" rim to fit in the back wasn't as easy as i thought it was gonna be. I had to make some bolt whole spacers/washers and also a hub spacer to push the sprocket away from the rim to get the correct alignment for the chain. It was kind of a headache but came out pretty cool.
This is the chunk of aluminum after a while of turning. That blue can kept me going.
Finally finished, The bolt hole spacer/washers and the sprocket spacer. The spacer is centered to the hub of the rim and on the other side to the sprocket, Some grade 8 bolts and we should be good to go.