So I've been trying to put a new inner tube on a Crest rim. Got some new tubes from Innertubes Shop. Tried 5 tubes, 2 different tyres and replaced rim tape, once with new fabric tape and once with 3 wraps of electrical tape. Each time tyre deflates with a new puncture.
What am I doing wrong? And please don't say using tubes on tubeless rims, I might cry.