http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: What's the point of the lock ring on an inner tube ? en Wed, 13 May 2026 05:09:28 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138426 Tue, 31 Dec 2013 21:38:33 +0000 Kenny 138426@http://citycyclingedinburgh.info/bbpress/ <p><em> Yup, what Dave and WC said</em></p> <p>Add me to that list. It comes in handy mostly when inflating a brand new tube with zero air in it. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138199 Fri, 27 Dec 2013 19:52:54 +0000 kaputnik 138199@http://citycyclingedinburgh.info/bbpress/ <p><em>"For me, I use them to stop the tube sinking into the wheel when I'm trying to push the pump onto the valve."</em></p> <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138191 Fri, 27 Dec 2013 18:09:20 +0000 Smudge 138191@http://citycyclingedinburgh.info/bbpress/ <p>Yup, what Dave and WC said :-)<br /> Never had a problem removing them and witnesses to my bikes will confirm they get a hammering and not much maintenance :-o </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138179 Fri, 27 Dec 2013 16:27:03 +0000 Wilmington's Cow 138179@http://citycyclingedinburgh.info/bbpress/ <p>"<em>For me, I use them to stop the tube sinking into the wheel when I'm trying to push the pump onto the valve.</em>"</p> <p>+1 </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138177 Fri, 27 Dec 2013 16:22:28 +0000 DaveC 138177@http://citycyclingedinburgh.info/bbpress/ <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138069 Tue, 24 Dec 2013 13:18:37 +0000 crowriver 138069@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>* - has happened a few times in the past! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138063 Tue, 24 Dec 2013 12:37:28 +0000 wee folding bike 138063@http://citycyclingedinburgh.info/bbpress/ <p>On Schwalbe they have a wee lip which acts as a converter for Shcrader rims using Presta valves.</p> <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138055 Tue, 24 Dec 2013 11:24:12 +0000 kaputnik 138055@http://citycyclingedinburgh.info/bbpress/ <p>I thought it also stops the valve stem rattling in a deeper profile wheel. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138049 Tue, 24 Dec 2013 10:14:34 +0000 gembo 138049@http://citycyclingedinburgh.info/bbpress/ <p>Best to avoid pinching by inflating, deflating and re inflating to desired pressure when mending puncture </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138048 Tue, 24 Dec 2013 10:03:34 +0000 remberbuck 138048@http://citycyclingedinburgh.info/bbpress/ <p>Sorry for being unclear.</p> <p>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.</p> <p>If you deflate your inner a little and then pull on the valve you'll see what I mean.</p> <p>But take care! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138047 Tue, 24 Dec 2013 09:51:43 +0000 Charterhall 138047@http://citycyclingedinburgh.info/bbpress/ <p>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 ? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138043 Tue, 24 Dec 2013 09:39:35 +0000 remberbuck 138043@http://citycyclingedinburgh.info/bbpress/ <p>I wonder that every time I have to unscrew them to get the track pump nozzle on, the curse of deep rims.</p> <p>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.</p> <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138039 Tue, 24 Dec 2013 08:02:35 +0000 wingpig 138039@http://citycyclingedinburgh.info/bbpress/ <p>So that the valve stays where it is when you apply or remove the pump nozzle?<br /> I once managed to rip put a Schraeder valve when trying to remove a pump. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11940#post-138038 Tue, 24 Dec 2013 07:46:19 +0000 Charterhall 138038@http://citycyclingedinburgh.info/bbpress/ <p>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 ? </p>