From Schwalbe: "[...]this tire has to be driven with tube! In your case the SCHWALBE tire G-ONE ALLROUND RG tire must not be used tubeless!"
From CNC-bike: "You can count on that these tires are tubeless ready for sure."
Just seen this reply. You got your refund yet? And an apology? Maybe some extra credit?
"Hi, o.k., we've sold a lot of these tires and there have never been any problems. You can send it back to us, we'll refund the money and the shipping costs for this."
They've changed the description at least.
@TM started
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From Schwalbe:
"[...]this tire has to be driven with tube!
In your case the SCHWALBE tire G-ONE ALLROUND RG tire must not be used tubeless!"
From CNC-bike:
"You can count on that these tires are tubeless ready for sure."