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I also just noticed that Zipp have modified their online tire pressure calculator when hookless is selected, so that when it comes up with a pressure that exceeds the rim pressure rating, it throws up an error message instead simply saying use the maximum pressure. Not sure when that change was made, but I remember it not being like that when I last used it (for example, it would just say 72.5 psi for 28 mm tires on hookless rims even if you put a 250-lbs rider in there).
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