I recently built up a set for a petite female rider but think they were 650c rather than 650b. They were Kinlin. https://www.sjscycles.co.uk/rims-tape/kinlin-mx3t-650-571-rim-black-32-hole/ The frame was custom made to measure.
It's the paucity of tyre choice that meant we stayed clear of 650c.
@Saffronspokes started
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I recently built up a set for a petite female rider but think they were 650c rather than 650b. They were Kinlin. https://www.sjscycles.co.uk/rims-tape/kinlin-mx3t-650-571-rim-black-32-hole/
The frame was custom made to measure.