-
Good god, I'm shocked that anyone is still making steel rims
Edit: it's for rod brakes anyway I think?
The Westwood rim style of cycle rim is used on bicycles with rod brakes, usually the roadster cycles found in Britain up to the 1960s and still common in the South and East Asia and Africa. Westwood rims have rounded sides, so they are not suitable for use with caliper brakes. The inside circumference of the rim has a slightly concave profile to aid with seating of the brake pads
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