• And the Hed is 21mm internal, I take it that is therefore the highest possible internal width for road tyres? (25 or 28c for example)

  • I've got some wheels with Belgium Plus rims which I run (sometimes) on one of my bikes with 23s. Never had any issues. In fact, they work very well.

  • It depends on the bead to bead distance for the tyre. Some 23mm tyres are not really 23mm are they. I personally like tyres that bulge a bit. That protects the rim and its more like the tyre shape the manufacturer intended. Tyres that are over stretched do feel a bit more skittish. A bit of sidewall flex is desirable.

    The first time i used a 25m gp5000 tyre i fitted them to 20mm internal width ailerons and the centre of the thread wore thinner than the shoulders when i pulled it off after holed.

    I am quite picky with tyres.

  • This is good to hear. Just put a set of 25c GP5000’s onto some Belgium Plus rims as Schwalbe One 28’s didn’t like the fork clearance. Schwalbe Pro One 28’s work fine on my other wheels & id wrongly assumed that wider rim would increase width & reduce the height of a tyre

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