if it isn't a puncture (i remember one tyre being rubbish) take the rim/tyre to a wheel fitter and ask them to polish the bead surface of the rim, then refit. or try an inner tube?
it isn't a puncture
How do I check for a puncture on a car?
#sooutoofmydepth
Most punctures on cars will still retain the offending item - nails, staples, screws, etc. If you see one of those it's a puncture.
@mashton started
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if it isn't a puncture (i remember one tyre being rubbish) take the rim/tyre to a wheel fitter and ask them to polish the bead surface of the rim, then refit. or try an inner tube?