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@Chak
There not many really. 25.4, 26, 31.8mm and maybe others that are weirdo French and alienese. As far as the majority of people are concerned. It's those 3.
I personally run 25.4 but that can be a pain once you start getting into drop bars (Road stuff) but for track, Nitto do all forms of nice stuff that's in 25.4. For a premium.