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Think he means these: https://www.lfgss.com/comments/14172150/
As they're disk rims they wont do what you need though.
650b rim brake rims are hard to come by. Velocity do the A23 in machined side wall variant.
If you find something cheaper I'd also be interested as I've got a bike I've thought of converting with super long drop brakes, but the cost of the rims has always put me off.
Scrabble-
I think this has been asked a couple of times.
Asnswer was, well, not many rims do exist in this size with braking surface.
SJS has one but it is steel so braking won't be sharp:
https://www.sjscycles.co.uk/rims-tape/westwood-26-x-1-12-inch-584-rim-chrome-36-hole/HED does one:
https://www.compasscycle.com/shop/components/rims/hed-belgium-plus-650b-rims/And so does Velocity:
https://www.modernbike.com/machined-650b---27.5-rims -
Also the Pacenti Brevet
https://thecycleclinic.co.uk/collections/rims/products/pacenti-brevet-rim-650b-32h-drilling
Vince
motoko
Which ones?