Check the tyre wall, but I think the ETRTO size is 451 in which case a Schwalbe Durano would be the obvious choice http://www.sjscycles.co.uk/schwalbe-durano-hs399-rigid-tyre-20-x-1-1-8-inch-%2828-451%29-prod19923/
@gbj_tester started
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Check the tyre wall, but I think the ETRTO size is 451 in which case a Schwalbe Durano would be the obvious choice http://www.sjscycles.co.uk/schwalbe-durano-hs399-rigid-tyre-20-x-1-1-8-inch-%2828-451%29-prod19923/