• Depends what you expect from the tyre.
    What is correct and what is wrong?
    Sometimes it's even better to ignore the by the manufacturer prescribed mounting direction.
    E.g. CX tyres Clément Grifo pattern.
    You would assume that the point of the arrow or "V" should point forward, when seen the tyre from the top.
    But many riders have positive experience with assembling it differently.
    The even make difference for front and rear, muddy and dry conditions.
    Grip, mud build up on the bike, steering, low rolling resistance, ...
    Personally, I must say that I'm such a lousy rider, that it doesn't make any difference to me. Don't notice the difference, as long as the tyre size is correct, as well as the tread and the air pressure.

    Perhaps the guy made a mistake, perhaps he did it on purpose.
    In this matter, there is no right or wrong.
    And if there is:
    Right: nice clean soldering of the lugs
    Wrong: transition head tube - head set - forks

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