Airhead (motorcycle)
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Airheads are the traditional BMW motorcycles with an air-cooled engine (including the [BMW 247] engine) that were built from 1923 up to 1995. The airhead design was replaced by the oilhead, which is differentiated by the fact that it's more oil-cooled.
While the term Airheads provides description of the type 247 engine produced by BMW until 1995, an airhead can also be someone who rides these machines. Airheads are a collective group of people with a shared passion for these machines, which are no longer produced by BMW. Airheads share knowledge about the motorcycles and how to maintain them. As of 2006, there are approximately 8000 current members of the international Airhead group, with about 3000 active members.