Oops, I stand corrected on the R65 mono part. I had mis-remembered the description in Zimmerman's BMW Motorcycle Buyers Guide where he describes the origins of the G/S then the creation of the ST as a street version with forks and frame similar to the R 65 with the use of the mono rear end on the ST.
Merritt Island, FL
When a person asks you for advice, they don't want advice. They want corroboration.