Re: rebore sprocket and bolt holes
The flange diameter (the largest diameter on the hub) is 7cm so I'd want to rebore to probably 8cm.
The bolt hole diameter are 6mm but they would need to be "moved out" on the sprocket to make room for the hub diameter.
I spent some time looking around the forum for an answer the best I've seen is coaster brake conversions. I need a larger rag joint and half moons to refab my sprocket.