I have a roll of 125 film. It's sealed, but the box is exactly the same size as 122 (and 124). Tomorrow evening, I'll open it and measure the spool.
I do know that 122 film is exactly 3 5/8" wide (3.625 inches) and the longest roll was 10 exposures.
118 film is 85 mm wide and the longest roll was 12 exposures.
I'm surprised that you have a camera that uses 125 film. The only one I've ever seen is a Kodak 3B. It was some kind of fancy box camera.