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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.
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 :(