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I use the normal Gravelking tubeless, works for me. (3000 km so far, no incident to declare)
I had a chat with a guy at the Panaracer booth at Eurobike last year, and he was telling me that although they are not labeled as tubeless-ready for liabity reasons, the sidewall construction of the Gravelking and the very tight bead tolerance made them rather suitable to a ghetto-tubeless conversion.
Anyone have an idea if / when normal Gravelkings will be tubeless ready? They seem to have released the 650b in tubeless ready, but not 700c.