• Tyre popping off the rim question here
    Happened twice now
    First time I thought it was the cheapo tyre, so binned that and changed to Schwalbe ones, new tube, new rim tape
    Happened again, tube and tyre seem fine
    No apparent distortion to the rim wall, clincher edge seems uniform around the inner wall
    Rims are Weinmann 27x1 1/4, probably 1970’s-era, tyres at a modest 55/60psi
    Any ideas? I’m stumped :(

  • Hmm, could be
    What would the tyre options be
    Much confusing

  • back in the 70’s I’m sure that won’t be a clincher /hooked rim

    It probably won't be, but we did have them back then.

    Weinmann 27x1 1/4, probably 1970’s-era, tyres at a modest 55/60psi

    Without a hook/crochet, 1970s 27×1¼" were typically rated for 45psi max. When hooked rims were introduced, they were called HP (high pressure) as the first ones allowed you to reach the dizzying heights of 60psi. The tyres would be marked with two pressures, one for normal rims and one for hooked.

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