25.4mm on the left, 31.8mm in the middle, 26.0mm on the right. Simple and easy. I change around stems and bars a lot, so I appreciate this.
I also sold my old Trek 510 last night, so I have a bit more room in my shop now.
* The frame was $100 on ebay. I probably could have found a complete bike locally for not much more if I wanted to be patient, but this cam...