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@pedro82 Better price and reasonable postage if you are in the uk https://www.sjscycles.co.uk/inner-tubes/schwalbe-av4-schrader-tube-400a1618-tyres-37340-28349-to-37349-28355-to-35355/
This is even cheaper but I haven’t tried them so worth double checking the measurements:
https://www.alpinetrek.co.uk/schwalbe-16-18-inner-tube-no-4-28-37-340-355-inner-tube-bf/?aid=9357a43b47a44e7ad83e892e4d534a80&pid=10004&gclid=EAIaIQobChMI3N2Do-yggQMV0vDtCh3H5AJ5EAQYAyABEgJEAvD_BwE&wt_mc=uk.pla.google_uk.18012023039..
Sorry, to be clear, what tubes (model numbers or sizes) do people recommend? Only tube I could find quickly was a 16” Halfords own brand, it was for a 305mm rim so nearly impossible to get the tyre on without pinching it. The LBS had “Brompton size” tubes in and, while I’m happy to buy local, £10 a tube is pretty steep