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  • I dunno, those are 60tpi which are different to the 300tpi 'open tubular' challenge tyres.
    My guess is vulcanised.

    Also Challenge tyres are all made in Thailand.

  • Anyway, still these are the nicest tyres by far in that price range - show me any other clincher tyre with a herringbone or diamond pattern for under 20€.

  • The new cheaper (lower TPI) versions of Challenge tyres come out of Duro in Taiwan

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