I've never come across a handlebar that doesn't narrow to 22.2mm at the controls area, what is it from out of interest? All I can think of is to shim a modern 31.8mm road lever, but that doesn't seem a wonderful idea... :|
Hi. They are for a pair of cowhorn handlebars I have had made to fit a peugeot 10 speed racer which has a 25.4 mm stem. If I'd know the stem diameter beforehand I would have bought a raleigh or something similar. Have also heard stories about some peugeot stems breaking!