Tube pinched by rim - h plus son

Also I wouldn't recommend trying to fit anything over a 23c onto these rims, I tried 1 28 and two 25s and they all blew out/nearly blew out the inner tube due to them not sitting in the rim properly. No amount of pushing around could get the tyre to properly sit in the rim, even after all the things suggested here.

Phew! So it wasn't my incompetence that fucked those inner tubes then, Stef?

Do you still have the 25 Marathon Ultra? I'm looking for a second one but CRC and Wiggle are sold out.