• Not necessarily the case. I fitted some new tubeless tyres at the weekend to my Swiss summer wheels (not that I'll get the chance to use them this year, it seems) and they held pressure overnight. Lost a little, but they were still at 60psi after 12 hours and with no sealant.

  • What tyre and rim combo? I’ve never had that, can get them to seal without problems but they usually leak air consistently until the sealant goes in.

  • AForce AL33 rims with 23mm Schwalbe Pro One tyres. I've had similar results with XR31T rims and 25mm Schwalbe tyres too, albeit not quite as airtight.

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