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  • Won't it want too squirm out at low pressures? It's well out of the range advised on Sheldon's tyre size chart.

  • Just saw his chart, I'd take it with a pinch of salt TBH.

    Old MTB rims are usually 17-18mm internal, it's only recently that MTB have 21-23mm internal width as normal.

    I'd says this is much more accurate (althought you can go one smaller like 23mm on 17mm internal);

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