Inner Tube pushing itself through Rim Hole

Cannock Chase

I notice that almost every time I pump up my tyres, I have to screw a bit more on the inner tube valve locking knurled ring. The inner tube has pushed itself a little further through the rim hole. This morning after pumping up the tyres on my "best bike" after its winter hibernation, I gave it three or four turns. Unfortunately the tube then burst at the valve joint. How do you stop the valve trying to push itself through the rim?

Hope this makes sense.....

drlodge

The valve locking nuts aren't needed so I reckon there must be something wrong with your rim/valve hole or inner tube. Can you measure the size of the hole? Or may be try another inner tube which has better reinforcement at the valve/tube junction.

lostboysaint

Too big a hole in the rim tape. Get some decent rim tape and put a hole just big enough to get the valve through in it.

desweller

The ring is only there so that, if you have deeper rims, the valve doesn't disappear into the rim when you're trying to pump it up. You don't need to do it up tight. On most rims you can throw it away.

Check the rim hole for burrs.

Cannock Chase

Thanks for the answers. I only do the knurled nut up tight enough to stop it rattling. Maybe if it wasn't there at all there'd be no rattle. The rim tape seems pretty good, but I've stuck two thin strips of duct tape over the valve hole so will see how it goes. For information the failed tube was Kenda have replaced it with Continental.

pilot_pete

Depending on the exact size of the valve hole in the rim, you can stop any rattling without using the lock ring by applying one wrap of electrical tape around the base of the stem of the valve. With a deeper rim you may need to wrap a bit further up the valve stem, but the tape also serves to make the valve a tight fit in the hole. For real perfectionism you can use a sharp blade to trim it off nicely around the valve stem just where it comes through the rim.

Another method is to cut a small oblong of electrical tape and push it down directly over the valve stem using the valve stem itself to puncture through the the tape. Push the tape all the way down and seal on the rim. This will prevent rattling but in my opinion is not quite as neat as the former method.

robbo2011

why not just use the lockring? much easier than messing around cutting tape to size. Or is this part of some obsession about weight?

MountainMonster

There certainly barely noticeable too, so i'd say that it makes no difference using the lock ring.

Anonymous

robbo2011 wrote:

why not just use the lockring? much easier than messing around cutting tape to size. Or is this part of some obsession about weight?

A lock ring to stop rattling seems like using a hammer to crack a nut to me.
Tape is not exactly difficult to do and lock rings come loose, tape does not.

The lock rings only purpose (afaisi) is to stop the valve being pushed back into the rim (and possibly ripping the tube at the join) when topping up a partially inflated tyre.
That said, most tubes (i.e. latex and tubular) than need topping up every ride, do not tend to have threaded valve stems anyway.

If you had an unthreaded valve stem that rattled in the rim, to solve it, would you:
A/ Thread the stem and put a lock nut on. or B/ Stick some tape around the stem?

I do not have a weight obsession, I just prefer to do things properly.