I live in the United States, in the town of Hamburg, just south of the city of Buffalo, on the shore of Lake Erie. I have had my R90/6 for 40 years. I do occasionally look at new motorcycles, but nothing seems like that big of an improvement over the R90. I have not ridden my motorcycle for a few years due to illness, but I will be riding again in the springtime with a bit of luck.
When you used the phrase "Gummikuh" were you referring to the 650 or the 250?
Oh, I wish you a speedy recovery for your health!
I think "Gummikuh" were called all BMW-motorcycles.
I guess because of the cardan drive.