Thanks to abdon for explaining something very important! I have asked the higher powers that be(compass bicycles) for a more narrow 650b tire. I know 650b is all about fat and cushy, but that is for average to large sized riders! I am interested in 650B because I am that 5'2" little woman who wants smaller wheels on my bikes. I had a 26" wheeled bike and hated it. I have not tried 650c but it has it's own availability issues and lacks any supple tire choices. Also converting a 700c bike to 650c could be more problematic, you really do have to look into shorter cranks etc. I think 650b would be a good size to convert my bikes to, but being small I would really like something more narrow than 32mm, because for me, they would not be narrow, they'd just be perfect. My husband recently got the 700x32 'cypres' tires and they are actually only 30mm wide and really big! I have a few small vintage bicycles that were designed for 700c which is so silly because you can see the compromises made in the design. No bicycles for little people should be made with 700c wheels.
Also, I believe narrow 650b tires would handle well on small bicycles with small riders. If Heine and his colleagues are all largish mens, the results are going to be different, no?