Yes, the section from Ardenvoir N to 25-mile is part of the WABCDR. You might hook into the discussions on advrider.com and other forums about the WABCDR. I've done the paved road N out of Ardenvoir and it is fantastic until it peters out. And I've done the S. half of the WABDCR to Ellensberg on my S10 and the section from Chelan N to the border on a Wee. (Not much help I'm afraid about the section you're asking about.) In both cases, 98% of the route was great on the bigger bike, but 2% was white-knuckle (especially on the S10) with occasional rocky pitches where I really wanted to be on a smaller bike.
- Mark