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I think the number of companies making dedicated tubes for any of the 650 sizes other than 584 (27.5” mtb size) must be pretty minimal.
I used to have a couple 650c bikes and any time I bought tubes they were marked as another size with the 650c but in much smaller text underneath it on the back of the box etc.
M_V
@doubleodavey
I bought a pair of 650c inner tubes back in Feb. Went to fit one today and it is 622 rather than 571. Checked the other one and it's the same. What sort of a mean trick is that to play on someone?