multimodal commuter
Join Date: Nov 2006
Location: NJ, NYC, LI
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Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
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I'm with you, Andy! And since OP has not clarified, I'm staying with you.
As far as handlebar diameters go, there are two places to measure, namely the clamp and the bar itself.
The bar itself generally has one of two diameters, best considered as inches: 7/8" (22.2 mm) for flat or upright (including steel drop bars), 15/16" (23.8 mm) for aluminum drop bars. The metric (French) equivalents are 22mm and 24 mm. The reason for this is mostly historical.