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FWIW, I had no problems fitting new 25c and 25c gp5000s to the R (18mm internal) hooked rims.
My approach is not to try and use my thumbs to push the tyre bead over the rim but to sort of roll it on. Also after reading these horror stories tried getting them off and after releasing the bead from the rim on both sides (this was the hardest part) only needed one lever
wence
Is the tyre the clincher or tubeless version?
I have trouble even with the clincher version (25mm) on my lb rims but I imagine the tubeless version is very tricky to get installed.