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  • 12% better rolling resistance
    20% better puncture protection
    10 g lighter (25-622) than the GP 4000 S II

    Aerocoach have confirmed the rolling resistance is better (not sure if it's 12%) the rest is un tested. I've bought a pair to try them out.

  • Ah I guess I’ll have to try them.
    We should really pool our testing expenditure over the next few months!

    Have you tried the 46/34 yet?

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