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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
@mashton
Which ones?