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If it's a 31.8mm MTB bar then it tapers to 22.2mm at the grips - same as it ever was - so any MicroShift thumbie will fit. If you are sticking with Indexed shifter they make SRAM or Shimano 12spd - but if you are going to go Thumbie then friction is where it's at anyway.
If you mean a 31.8mm drop-bar then you can combine a [**Paul 31.8 MicroShift clamp**](https://www.paulcomp.com/shop/components/drivetrain/shifting/microshift-thumbies/) with a MicroShift barcon shifter.
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