I use a couple of Incredibells that fit up to 26.0 or so, but sadly my Adjustabell failed. The small plastic tab that needs to catch the strap eventually stopped staying in a position to keep the strap tight. So I have one bell down on a 22.2 quill stem adapter and on the other bike it’s on the top tube, which is 25.4.
My stems are 31.8 so I’ve been looking for other options. I don’t own either but the bells from Arundel and Spun Cycle are in one of our local shops. They seem of good quality, especially the Spun Cycle bell, and at least some of their bells fit 31.8.
Otto