• Isn't that a considerable amount on something like rim width though?

    Running Open Pros with 23mm GP4000s tyres at 120psi, but I'm 100kg, and interested in trying some 25's. Seem to get very good Strava segment times (in general, but especially for my weight), so I guess they're a pretty fast combo.

  • Not really, no. Perhaps 5psi?

    Seem to get very good Strava segment times (in general, but especially for my weight), so I guess they're a pretty fast combo.

    No, they're not fast but they're reliable.

    Wheels are going to make very little difference to your speed unless they're deep and/or exceptionally light.

  • but I'm 100kg, and interested in trying some 25's.

    25mm (or even 28mm) is advantageous if you're above average weight, with 25mm you'd only need to pump them up to 100psi.

    On the girlfriend's old road bike, she had 23mm, but only because she's 53kg, and run them at 60psi front/80psi rear.

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