I’d say 25mm if you’re going to be racing on good road surfaces. 28mm if you’re going to be racing on not so good road surface (they’re slightly less aero but will roll better so faster overall). If you’re not racing I’d go 30s or 32s. Or go with the mullet and have narrower tyre on front where you’ll get the aero gains, and wider on the back where comfort counts. On my non race bike I’m running 28F, 30R, for this reason.
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