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https://www.sheldonbrown.com/cribsheet-headsets.html
If the stem/quill is 28.6mm (1-1/8"), then the steerer inner diameter will be the same and the steerer outer diameter will be, as you say 1-1/4" or 31.8mm.
I imagine a straight adapter is available, just the usual is 1" to 1-1/8".
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is this what you're after?
Maybe check details with the seller
Egghead
frankenbike
@Jonny69
Can anyone tell me about old mtb quill stem standards? This one is a 28.6mm (1-1/8”) quill with 31.8mm bars. What is that, a 1-1/4” steerer tube?
I’m looking for a round replacement or a 1-1/8” to 1-1/8” quill adapter to use an Ahead stem. Does that even exist?
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