• gp5000 25c would become 29mm wide and gp5000 28c about 31mm, so a great match with the rim shape:

    28c Vittoria Corsa G+ :

    I have not tried them myself (yet), but people seem to be happy with them.

  • At what point the inner width is too much? 23mm is what my gravel bike gets, I'd be afraid of damaging the sidewalls on a 25c tire. Maybe there's finally a reason for tubeless road.

  • At what point the inner width is too much?

    You're in experimental, but probably not yet dangerous, territory when the inner rim width exceeds about 75% of the true (not nominal) tyre width. You can get away with more at the back than at the front, because the front leans more.

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