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G-Ones measure almost exactly 30mm @ 4 bars. There’s about 2 or maybe 3 mm clearance. I tried 28mm GP4000, and they were oversized, nearly 32,4mm and would rub while mashing uphills out of the saddle. GP5000 28 fit fine, they are not oversized, I can’t remember exact actual size. You can’t slam the rear wheel with probably any 28mm tyre, it will rub on the brake stay.
really? I have 28s in mine and it looks pretty tight. They are michelin pro4 endurance v2s. Wow that is not a catchy name