I bought some after market Bonanza rims or Azusa 8" spinner rims. The old style some how accommodated a brake and a sprocket. I can't find anyone that makes a bracket,:huh: or something to mount a sprocket to the after market ones I bought from Azusa. I did find a place that sells a disc brake set up for them, but very spendy, A company called Sky's the limit. Anyone with help on mounting a sprocket?