Tom, If you really want narrow 650B tires, you can buy Grand Bois Cypres 650Bx32 tires from the company's website <https://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=ja&sp=nmt4&u=http://www.cyclesgrandbois.com/SHOP/T650_F32_SS.html&usg=ALkJrhgDEI4jvXF9B4DVjYkDtlqSNd_DKw> in Japan. But I think that, yes, if you go wider, such as the 650Bx38 Loup Loup Pass from Compass, or the 650Bx38 Pari-Moto, you'll get the combination of comfort, speed, and traction that 650B tires offer. (Col de La Vies are far less supple and plush.) And in fact, I think that a few years ago Jan Heine of Bicycle Quarterly/Compass determined, through testing, that 42mm is the optimum width for performance on 650B tires. This is especially true on rough roads where a wide tire soaks up bumps that would, on narrower tires, cause "suspension losses" that slow you down. So: your current tires might be the ideal width, after all.
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