Interesting. iirc I had actually issues with the height and not so much the width, so maybe it's fine with larger rims indeed (or the Schwalbe were different height than other brands which I did not try on the 303s. I ran latex tubes w/ 25mm then on the hooked narrower wheels...).

I plan to revisit my tyre choice for next season. Probably trying out the 5000TT with 25front/28rear.

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https://besse.info/
https://www.strava.com/athletes/2012033