A couple of years ago three of us modeled a ride around the Washington discovery motorbike route mentioned previously. But we detoured/re routed for the single track descents. Rode from eburg up over naenum/mission ridge and down Devils gulch. Up and along Entiat ridge and down the mad river trail. Up the Entiat and over shady pass and down Devils backbone and pot peak trails. Around the south end of lake Chelan, out grade creek and into the Chelan sawtotloyhs from the s. Angels staircase and foggydew trail to the Methow. Starvation, golden staircase, back to Winthrop. Overall picked some of the "classic" oldschool mtb trails of the cascades connected by lots of beautiful first road.
A more "touring" route I enjoyed : from the west (hwy 20 or a variation of the above) to Winthrop, over (?) pass to conconully, up the sinlehekin to oroville, and basically straight east through chesaw. Cerlew, north port, metaline. One could continue into ID through granite pass, but I returned via 20. Much more of a backwoods tour than a trail ride, but pretty quiet and remote overall.
Fact is, if you want to get across the washington cascades on a bike, legally, you're on hwy 20 (pretty nice on a weekday), hwy 2 (more in a bit...), I90 (no thanks), or one of the southern passes near rainier (I think the motor bike route does this). The best route I've found across the north/central portion is over Stevens pass via tye creek, into lake wenatchee via smithbrook (mentioned above), and over Entiat ridge to entait/Chelan. I guess it depends on where you're trying to get to, but I'm also just partial to the ncw. Again, a "touring" route, but with plenty of wildness and vertical.
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