There was no official
R80RS,although there are a few 80's about with
fairings on. The 800 can't take the sustained
speed the RS fairing allows.The RS Fairing,
developed in a wind tunnel actually creates
downforce and helps hold the bike to the ground
so it doesn't go light at the front end when
travelling at speed.
As to the differences
between the R80 and R100, I think the R80 was
suppose to be the affordable BMW of its time.
It was designed to compete with the Japanese
and Brit 750 cc bikes of that era. While the
R100 was designed to compete with the super
bikes that the Japanese and Brits were introducting.
The beauty was they were better built, and more
reliable bike than any of its competition, but
cost more initially. While the Japanese and
Brit bikes were less expensive, their life expectancy
was about half that of a BMW. Also, the maintenance
cost on those Japanese and Brit bikes was higher
over the long haul than the BMW's
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