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  • Thanks all for all the answers.
    So to sum it up:

    GK:
    Tubeless
    Heavier?
    Brown wall

    PM:
    Not tubeless
    Lighter?
    True gumwall

    I'm planing to run with tubes and will probably go black anyway since I'm not into the whole gumwall vanity thing. Price is almost identical so which one is best for a winter trainer?

  • Panaracer website gave 310g for the 650bx38, so not that heavier actually.
    Brown wall will survive winter better though.
    As I haven't got/see the 650b GK so that above comment is based on website data only.

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