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Heitzman
ElGato
Emyr
My 38mm Pari-Moto measure 37.6mm on rims 23mm external and 18mm internal.
So, yes, it could be the rims but also pressure or how much use the tyres have got.
If the 27.5x1.75 Gravel Kings don't work for you and prefer not to send them back I might be interested.