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  • The main aerodynamic effect is then that of a bluff body, being the tyre. Make the tyre wider, you increase the drag, simple as that.

    But the wheel does horrible things to the passing air. This is why Zipp rims actually increase in diameter before narrowing to the spokes. Its to push some of the passing air away from the spokes. 25mm tyre would do this very well with being too wide. 20mm tyres are lighter. The best balance (for racing) it seems is 23mm.*

    (*all just stuff I read on teh interwebs somewhere)

    Regarding the OP.

    I would argue that narrower tyres would be less pu*c%ur& prone than wider ones. The higher pressures and narrower profile would mean that stuff should'nt stick into them so much.

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