Mountain bike
*Vultures Knob>>>Pit Bike

I just bought a new inner tube for my pit bike, it inflates and holds air but as soon as the pump is removed..


it starts deflating again. I can't think what's wrong with it. When I bought it, it came with two nuts at the end of the valve (before I put it on the wheel) I think one is to go on the outide of the rim and one on the inside so the valve doesn't slip into the rim.

Actually the 2 nuts go on the outside of the wheel, they lock together so the stem cannot pull back through. Be sure when you tighten them down you leave about 4 threads from the bottom, when you go through a turn the wheel flexes and can pull a hole in the stem base, causing you to get a new tube. Be careful. Now, if you take the pump off the stem and then it leaks, I'm willing to bet the valve stem core is loose.
The valve itself could be loose ?, try using a valve tightener on it !..
If its a car style valve , a schraeder then the centre of the valve needs tightened with a valve key , if its an ordinary cycle valve maybe you have nicked the tube but it sounds like my first suggestion.
It is so easy to pinch the tube on small tires. Try again! Monkey Grip Patch kit or another new tube, look for the double hole from screwdriver pinch. rounded tire irons and lots of talcum powder. I partially inflate the tube so it does not get twisted tuck it in with one side of the tire already on the rim. And then suck the air out this makes the tube smaller and talcum lets the tube slide around now carefully turn the other side of the tire over the rim.
I have mounted 1,000's of different kinds of tires. Nissan Master technician
If it inflates and holds air until you remove the pump then the only reason can be the valve core---put some spit on the core and see if it bubbles indicating an air leak
Just dab a little spit on the valve stem,if you get a bubble it's the valve leaking,if you don't ,you have pinched the tube.
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