Many years ago, there I was beside the road on a wet winters night having suffered a puncture and finding great difficulty in unscrewing the lock ring to allow me to remove the inner tube. I've never used them ever since and have had no problems. This leaves me curious, why do the manufacturers always supply them, what are they for ?
CityCyclingEdinburgh Forum » Questions/Support/Help
What's the point of the lock ring on an inner tube ?
(14 posts)- Started 10 years ago by Charterhall
- Latest reply from Kenny
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Posted 10 years ago #
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So that the valve stays where it is when you apply or remove the pump nozzle?
I once managed to rip put a Schraeder valve when trying to remove a pump.Posted 10 years ago # -
I wonder that every time I have to unscrew them to get the track pump nozzle on, the curse of deep rims.
However, having once had a disastrous and unrepairable puncture when the tyre hit a bump just at the valve point, and the inner was forced through the rim by the force, I've not minded that much.
So, while I have no idea if this was the original purpose or not, keeping the inner away from the metal edges of the wheel is reason for me.
Posted 10 years ago # -
But surely the lockring should be on the outside of the rim ? How would that keep the inner away from the metal edge of the rim ?
Posted 10 years ago # -
Sorry for being unclear.
What the ring does is ensure that by securing the valve to the rim, on the outside as you write, that the inner cannot be punched through the hole in the rim to the outside, and thus rip and puncture.
If you deflate your inner a little and then pull on the valve you'll see what I mean.
But take care!
Posted 10 years ago # -
Best to avoid pinching by inflating, deflating and re inflating to desired pressure when mending puncture
Posted 10 years ago # -
I thought it also stops the valve stem rattling in a deeper profile wheel.
Posted 10 years ago # -
On Schwalbe they have a wee lip which acts as a converter for Shcrader rims using Presta valves.
I don't always bother fitting them though as they get stuck during the winter and can be a bother to get off if you need to swap the tube at night in the rain.
Posted 10 years ago # -
I find they are useful. They stop the inner tube valve from slipping and either retracting partly into the rim, or ending up at a jaunty angle. Ths can happen if your tyres get a bit soft, some idiot lets your tyres down as a prank*, or you have slow p******e. There's also a danger the valve can move when hitting a big bump in the road, causing the rim to cut the tube near the valve, and a p******e that is very tricky to patch.
* - has happened a few times in the past!
Posted 10 years ago # -
For me, I use them to stop the tube sinking into the wheel when I'm trying to push the pump onto the valve. I know we can either use the other hand or push the tyre and tube flat against the floor.
Posted 10 years ago # -
"For me, I use them to stop the tube sinking into the wheel when I'm trying to push the pump onto the valve."
+1
Posted 10 years ago # -
Yup, what Dave and WC said :-)
Never had a problem removing them and witnesses to my bikes will confirm they get a hammering and not much maintenance :-oPosted 10 years ago # -
"For me, I use them to stop the tube sinking into the wheel when I'm trying to push the pump onto the valve."
not required if you can be bothered with a screw chuck pump. I've destroyed enough tubes and had enough chucks fly off at high pressure to have given up on the "quick release" type altogether.
Posted 10 years ago # -
Yup, what Dave and WC said
Add me to that list. It comes in handy mostly when inflating a brand new tube with zero air in it.
Posted 10 years ago #
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