There seems to be quite a ridge around the valve area
The ridge is where the valve goes into the inner tube like around the valve piece.
At the moment I have the original rim strip in place, put in the bmx tube and seated the tyre – getting a swampthing on a 5.1d was extremely difficult. Then pumped with a track puimp but no joy.
Will try pressing down on the tyre on top of teh valve to see if that helps – but it just seems the air is going in the valve and out somewhere
Does any of the above look wrong?
Kwack