hey, randochap.
i'm over 40, have been repacking BBs and hubs since the 1970's, started touring over 20 years ago, and work in the industry. I'm not a youngun who's not really a cyclist. bosh. i just went and compared a street 26" 559 and my touring 622's and the difference is 30mm outside diameter.
grant's marketing of 650b is haughty masquerading as populist. that's my opinion about 584, when other manufacturers are able to use 559 or 571 or 622 as effective wheel sizes. Why not AE-3 or the S-6?
the pedigree of french bikes. nice. maybe grant can bring back the french bottom bracket

along with it.
a constructuer poseurfest.