Cheers!
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.
Sept. 14, 2020, 10:34 p.m. - Andrew Major
Cheers! 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.