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My setup :
Rims: WTB Frequency Team i23.
Tape: ?? Tesa tape I think. Taped 2 times, one pass seems a bit thin.
I had them running with tubes for a while, I think it helps setting the tape properly (no more wrinkles or bubbles).
Tyres: Panaracer Gravelking 32mm. I never tried the tubeless setup with the smaller sizes.
Sealant: Schwalbe Doc Blue - approx. 50ml per tyre. Took around two days to seal properly.
Pressure: 60 psi rear / 55 psi frontI've run tests* before riding. Tyre jumps out of the rim around 80psi.
(* well not voluntarily the first time. But then I tried a few times to see at what pressure the explosion occured)
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.