650b...For me?

You better be

Michael McDonald took a Trek 730 {lugged 531 Steel} frame as a platform and built a bike to be ridden, by Glenn, at the Aug ' 08 D2R2 Dirt Road Randonee.
Using a pre-built 650B Wheel Set, Rivendel Silver Long Reach Brakes, and various sweet "giblet" used parts, Mike proved to Glenn that one doesn't need a high end custom long dollar cycle to ride one of the finest dirt road adventure rides in the east! Yeah, I got a few comments, post ride, about my "heavy Trip ." The bike performed beautifully. Be sure to check out Mike's custom Giles Berthoud fender mount-up! Learn more about the D2R2 here and here and there is even a picture of this very bike here!
. See this bike at time 1:17 - 1:18.
Thanks to "Velo Fellow" for this great footage.