Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,211
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I recall reading several years ago that 650b were easier to find in former French colonies. But I have not traveled in any such locales so I have no clue if that is accurate or not.
I had an old 3 speed bike in the 1980s that used that tire size. It was virtually impossible to find a new tire so I have an inherent bias against that tire size. I still have the bike, have not used it since the 1980s.