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  • Supersonic 20c, a winning combination of speed and aerodynamics. I've always found them to be surprisingly tough, but you might find a GP4000s 20c slightly tougher.

  • I know they will be slightly slower

    Citation needed. The rolling resistance is very close, and the tread on the GP4000S seems to act as a trip, so some wheels have less drag with a 4000 than they do with a completely slick tyre.

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