BMW REAR DRIVE UNIT for 1970-1978 Models R75, R80, R90 32/10 Ratio - $250 (petaluma)

BMW REAR DRIVE UNIT for 1970-1978 Models R75, R80, R90 32/10 Ratio 1

BMW REAR DRIVE UNIT for 1970-1978 Models R75, R80, R90 32/10 Ratio 1 thumbnail

Thompson Lane near Bodega Ave

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condition: good

make / manufacturer: BMW

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BMW Airhead 1970-1978 rear drive unit with brake; condition of internals unknown, but judging from the amount of drive spline left (about 80%), there's a good chance it will work as is. Assume it needs a seal replaced at least before putting it in service. I bought it on eBay intending to use it on a bike I was building (/2 conversion) but never did, so I can't absolutely vouch for its functionality-- looks good, but I'd replace the seal anyway just to be sure, if I were going to run it.

32/10 is the ratio BMW had on most of its R75/5 and R75/6 models, also some R80 and R 90/6 models in the 1970s. It works well on /2 conversions with converted swingarms because it keeps the stock 1,2 ratio speedometer accurate within 1-3% depending on what rear tire is on it, and keeps the top speed at about the same as that of an R69S.

1970 1971 1972 1973 1974 1975 1976 1977 1978

post id: 7995927432

posted: 2026-11-05 14:36

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BMW REAR DRIVE UNIT for 1970-1978 Models R75, R80, R90 32/10 Ratio -...

BMW Airhead 1970-1978 rear drive unit with brake; condition of internals unknown, but judging from the amount of drive spline left (about 80%), there's a good chance it will work as is. Assume it...