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We have a Moda Major X CX bike, which my son uses for racing. The wheels on it are the world's most stupid size - 26 x 1 3/8" (650A or 590mm in ISO), and sadly the only CX tyres I have for it have reached the end of their natural life. One of them has stretched so much that they no longer stay put on the rim reliably.
[url= https://www.sheldonbrown.com/cribsheet-tires.html ]Useful reference for obscure wheel sizes[/url]
I've considered whether I'd squeeze a set of 650b tyres onto it as they are only 6mm smaller diameter, but even then there's not a lot of choice for CX tyres in this size.
Has anyone got any suggestions for alternative rubber for this bike before I either replace the wheels with a more sensible size, or relegate it to grasstrack (I still have a set of workable tyres for that!) and build him a 700c bike instead?