I am using the trick I read about Stapfam of leaking a bit of air before pumping air in, to make sure the presta valve is not stuck, so I wonder if this is the case.
Maybe changing the tire would solve it. I expect I would post another thread soon with the title "HELP, I can't return the tube back into the tire"
Originally Posted by
stapfam
My first thought was that the presta valve is sticking or you are not releasing it far enough before trying to pump up the tyre. And I am presuming it is Presta valves. I have had Schraeder valves that do not seal properly or the valve is not being depressed far enough when the pump is fitted.