Each of them offer tours of the Willamette Valley via bike, and seem competitively priced.
Also, if you’re interesting in planning your own bike ride, here’s a good article I found that gives some tips. The first tour is a great loop in an area I know pretty well — and very reasonable for time/distance. You’ll also not be far from some other great wineries: Trisaetum, Colene Clemens, Ayres, and Utopia (though they may be harder to access with dirt roads).
Finally, keep in mind that there is a budding cluster of urban wineries in Portland proper, and you could have a fun day tasting wine right in town. Check out the website for this group of in-the-city producers: http://pdxurbanwineries.com/
Hope you have a great trip.