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Christian Bynum's Classic BMW Motorcycles: Specifications
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Below is a comparison of fundamental specifications for Airhead models produced during the '70s.

Model Years Displ. Power Output
R50/5 70-73 496cc 32 HP @ 6400 RPM
R60/5 70-73 599cc 40 HP @ 6400 RPM
R75/5 70-73 745cc 50 HP @ 6200 RPM
R60/6 74-76 599cc 40 HP @ 6400 RPM
R75/6 74-76 745cc 50 HP @ 6200 RPM
R90/6 74-76 900cc 60 HP @ 6500 RPM
R90S 74-76 900cc 67 HP @ 7000 RPM
R60/7 77-80 599cc 40 HP @ 6400 RPM
R75/7 77 745cc 50 HP @ 6200 RPM
R80/7 78-84 797cc 55 HP @ 7250 RPM
R100/7 77-79 980cc 60 HP @ 6500 RPM
R100S 77-78 980cc 65 HP @ 6600 RPM
R100RS 77-84 980cc 70 HP @ 7250 RPM
R100RT 78-84 980cc 70 HP @ 7250 RPM
R100T 79-84 980cc 65 HP @ 7250 RPM
R100CS 81-84 980cc 70 HP @ 7000 RPM
R45 79-84 473cc 27 HP @ 6500 RPM
R65 79-84 649cc 45 HP @ 7250 RPM

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