Hey Scrod, are there any 1 inch stems that clamp 31.8 bars?
Buy one of these and take their stem.
In order to have drop bars and grip shift the builder cut a standard pair of road drops in half. Then sleeved them back together with a metal clamp that is 31.8. Then in all their genious they needed a threaded headset. So somewhere they found a bunch of 1" 31.8 stems.