It was a very common size in the olden days, so there are still some basic shopping bike tyres available http://www.sjscycles.co.uk/category-Tyres--26-(590)-199.htm
Thank you for letting me know, it makes sense now as the bikes from the 80's. The nutrak ones look like a good replacement.
@ASpicer started
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Thank you for letting me know, it makes sense now as the bikes from the 80's. The nutrak ones look like a good replacement.