• thanks hive mind, problem solved - went past max PSI and all things are peachy down at more normal pressures...

    ...for the next me, things I learnt:

    • make sure bead isn't caught on valve (pinch and pull to get it around)
    • wheel flat / horizontal on the floor seemed to work best (hanging also worked, resting on tyre does not)
    • its ok to go past max pressure a touch
    • soapy water in a mug with an old tooth brush is a very convenient approach to getting some soapy water in, and it really does help
    • you know its properly seated by letting all the air out: if it doesn't stay stuck keep trying till it does
    • stans valve core remover really is very handy
    • your wife is not going to be pleased when she realises you accidentally got goo all over her winter coat you hadn't noticed lying on the side
  • its ok to go past max pressure a touch

    It should be OK to go over it quite a bit, the certification test is something like 100% over the rated maximum. If you're going to high pressures on larger tyres to get them seated, you need to be particularly mindful of the rim pressure rating, which is often lower than the tyre pressure rating and decreases as the tyre section rises.

    soapy water

    Lubrication is good, but remember kids, the lubricant is the water, the soap is only there as a wetting agent. Everything which isn't water is going to be left as a contaminant after the water has evaporated, so use as little soap as possible.

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