Bevel gear set 27:7 sidecar ►see details

BMW service bulletin Nr. 1/63 (200) from May 9th 1963:
"Upon request of many customers it was decided to re-introduce the 27:7 ratio for the sidecar machines R60, commencing with frame number 623 980.
The hitherto used 26:6 ratio for the rear wheel drive is still availble on special request."