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1.5. At one time, I think we also had 1 1/4, which might have been the Klein Air Headset standard, though I'm not sure. Earlier cannondales were actually not 1.5, but with the move to standardization, they altered their preexisting dimensions to 1.5.

So in one sense, if you're talking industry-wide standardization, the next step is 1.5, though some companies have proprietary in betweens, which seem far and few now.
 
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