They have 26 x 1.3/8" on them, a redundant size?
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
@gbj_tester started
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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