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  • The hookless thing concerns me, probably wrongly, but it just triggers the "tyre come off it will!" part of my brain.

  • Weird thing is that the hook is a newish development. My wife had a Dutch bike with hookless steel rims. I was baffled by them but they worked and that was with inner tubes. My laymans understanding is that when there is air pressure in the tyre it is expanding in all directions so pushing the tyre bead up against the rim.

  • The first clincher tyres were beadless, the tyre was "clinched" between the tube and the (hookless) rim.

    Only worked with relatively low pressures though, hence the development of hooked rims and tyre beads.

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