The Koppenberg isn’t unrideable if you enter the full distance as by the time you get there the folks that entered the shorter distances will have cleared away. At least they have by the time I get there, but maybe I’m slow (9hrs for the full 250kms).
You read some people saying don’t bother riding the proper long course because all the hills come in the latter part of the course, too many people, blah blah… to my mind, if you’re gonna do the Ronde, you do the Ronde. Anything less than the full length and you’re just kidding yourself. And you’re missing out on the whole point of doing it in the first place.
I’ve done it 3 times – loved every single second of it, although very painful every year.