• Zona ones are 1.2mm wall thickness at the top, paint could account for the extra 0.2mm.

    You should be able to feel if not see the butting.

  • The fillet brazing is super smooth - there's no obvious butting my inexperienced eyes/touch can tell. But I've just measured it below the top tube/seatstays and it's 28.6 so that would make sense then, I think i.e. 30mm above because of the butting and standard below? Thanks for this, very helpful.

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