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Does anyone know what this means:

> last year we ran 32mm tires labelled as 30mm

That sounds dodgy, but maybe I'm missing some context.

bike tires have a manufacturer's specified width, but it's very common for the actual width of any given model to be 1-3mm wider

for competition purposes, there may be maximum widths (depending on the exact rules, more like 33-38mm), not based on the label but measured directly

Also the measured width of the tire will depend on the width of the rim it is installed on.

actual width varies with pressure and wheel it is mounted on