brake

Who makes those sprocket that bolt directly on the disk brake hub? or do anyone on here sell them??

On my way home tonight I was thinking of a sweet setup I might try; on the idea of a 3+ speed hub in between the motor and the wheel sprocket on the left side. I knew before hand of internal geared hugs, but visualized a problem installing a 2nd gear onto the hub. I was thinking of this in my...