Originally Posted by
AndreyT
Um... The value that ensures one-way air flow is located in the pump. As long as the pump head is attached to your tube valve, the tube valve is supposed to stay open the whole time. It is not supposed to act as a "valve" when you are pumping up your tube.
That would depend on the kind of valve. Schrader valves have to be held open to get air in the tube. Presta valves are check valves with a low cracking pressure. Air goes in and the valve closes once there is a pressure differential between the air supply and the pressure in the tube. A Presta valve
is supposed to act as a valve when air is being added.
Originally Posted by
eja_ bottecchia
Why do they even sell inner tubes with removable inner core? Seems like there is no advantage to their use.
Yes, in both types. Schrader valves have always had removable cores. Many Presta valves now come with removable cores. The Presta ones are for adding sealant to tubes (and for tubeless systems).
Originally Posted by
44.5mph
Your theory doesn't hold air.
Tried inflating using a 2nd pump. Same results.
Installed a new tube, used 1st pump to inflate the tire to 90 psi. No problems.
You haven't said which type of valve you are using but the solution is the same...get a core remover and tighten up the valve. Or just get a new tube.