The valve core should be gone if the tire needs to be expanded to hit the beads, because you will want all the volume a 1/4 hose can provide. This means you have to use a chuck with a separate on/off actuator, or one that's been modified and run with a closable valve elsewhere, so if you haven't got one of these, or a compressor, any tire or bike shop should pop the beads up for you, or you can bring it to me if you like and we can see what can be done at my place. Russ 562-4815