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Hi Jim, no I did mean 25.4mm clamp, I thought bars generally come in 25.4 or 26mm clamp area, unless they're over size 31.8mm, like on more modern bars?
GreatSince78-
25.4mm is the old British standard, which was adopted in the Far East.
26.0mm is the Italian standard, except for old Cinelli which were 26.4mm: they switched in the early Nineties.
So if you want 25.4mm, they'll either be old English bars (eg GB) or Japanese (eg Nitto).
If you want Cinelli, the old ones will be 26.4mm and the current, 26.0mm.
Scilly.Suffolk
Do you mean 26.4mm?