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I have a MURRAY BeachCruiser with exact same frame as this red bike, how is the drive sprocket(shown as red) mounted on the coaster brake axle ? My coaster brake rear wheel has no threaded outer hub to mount a sprocket on the left side

@1980sRELIC its not threaded it rubber peices https://www.ebay.com/itm/36T-Rear-S...802765?hash=item3ad41d724d:g:tnMAAOSwux5YQ3-f
its basically that it mounts to the spokes

what size/# chain does this motorized bicycle 36 tooth sprocket use ?

@1980sRELIC it uses the the stock one being 415