July 14, 20187 yr Just dealing with a bike which has a flat tyre. First thing I realise (other than I had never removed a hub rear wheel before and needed to find a YouTube video) was that the valve stem has no nut on it. Thinking I must be bonkers, I checked the front wheel. Exactly the same. So I checked my bike - front and rear both have the expected nuts on them. Please confirm that there is no new-fangled way of doing without these nuts - is there?
July 14, 20187 yr Just dealing with a bike which has a flat tyre. First thing I realise (other than I had never removed a hub rear wheel before and needed to find a YouTube video) was that the valve stem has no nut on it. Thinking I must be bonkers, I checked the front wheel. Exactly the same. So I checked my bike - front and rear both have the expected nuts on them. Please confirm that there is no new-fangled way of doing without these nuts - is there? lots of people don't bother to put the nut on. Saves weight. Seriously .....
July 14, 20187 yr Author lots of people don't bother to put the nut on. Saves weight. Seriously ..... Certainly wasn't expecting that answer! Thank you. What difference does it make? Doesn't it tend to allow the inner tube to move?
July 14, 20187 yr with no nut it can rip the valve as it cam move around and get cut on the hole. had loads of bikes as a kid like this and then split the tube buy the valve hole even buy pumping it up with a car foot pump
July 16, 20187 yr My Cube Touring EXC has no valve nuts either, and without them getting an inflator adapter to latch on can be difficult. Unfortunately I have found no source of said nuts other than motorcycle types which are heavyweight in appearance.
July 16, 20187 yr None on my Oxygen MTB either, however, the valve stem thread has a rubberised coating on it where the stem comes through the rim.
July 16, 20187 yr Author My Cube Touring EXC has no valve nuts either, and without them getting an inflator adapter to latch on can be difficult. Unfortunately I have found no source of said nuts other than motorcycle types which are heavyweight in appearance. This is a Cube and it has Schrader valves. The inner tube was pinched and has a split about 8mm long in it. Would explain loss of pressure! Looking round other bikes, it seems somewhat random whether they have nuts or not even within a make. Seen several threads around the web saying that the nut, or the second nut itf it has two, should be tightened up to the valve cap. (There's me thinking this would be a nice simple queestion.)
July 16, 20187 yr Most Schrader (car) type valves have no locknut. Presta always have provision for locknuts but they aren't always fitted. Both of my MTBs have them, my roadbike doesn't. One thing to be careful of is tightening them up with the tyre at full pressure, if you do you may not be able to loosen them when you get a puncture.
July 16, 20187 yr Don't they come with all Schwalbe tubes? Looks like they do but I think they are in the minority having a metal stem, most are rubber.
July 16, 20187 yr All my shrader tubes have lock rings and from memory always have had As for tightening them up against the valve cap that’s just pointless who ever came up with that little gem should definitely be ignored for advice
July 16, 20187 yr Looks like they do but I think they are in the minority having a metal stem, most are rubber. Schwalbe and continental are threaded I have both here as for the rest no idea
July 16, 20187 yr Author All my shrader tubes have lock rings and from memory always have had As for tightening them up against the valve cap that’s just pointless who ever came up with that little gem should definitely be ignored for advice More than one person out there recommended doing so. Backed up with something like it being standard in some form of motorbike sport. Claiming it acts as a locknut hence protects against loss of valve cap and entry of foreign matter.
July 16, 20187 yr All my shrader tubes have lock rings and from memory always have had As for tightening them up against the valve cap that’s just pointless who ever came up with that little gem should definitely be ignored for advice I've never seen or done it on a bike valve but locking two nuts together on the same thread is common engineering practice, so to an engineering mind, locking a nut and a dust cap together on a valve stem makes sense
July 17, 20187 yr I've never seen or done it on a bike valve but locking two nuts together on the same thread is common engineering practice, so to an engineering mind, locking a nut and a dust cap together on a valve stem makes sense Lol Most Valve caps have seals in them that definitely should hold them from turning loose and those that don’t have self locking property’s in them as the plastic/nylon make up of them grips the top of the valve stem So from an engineering point of view that should be good enough for that high stress job which is holding a poxy valve cap on Edited July 17, 20187 yr by Fat Rat
July 17, 20187 yr Lol Most Valve caps have seals in them that definitely should hold them from turning loose and those that don’t have self locking property’s in them as the plastic/nylon make up of them grips the top of the valve stem So from an engineering point of view that should be good enough for that high stress job which is holding a poxy valve cap on What ever you say
July 17, 20187 yr Author I've never seen or done it on a bike valve but locking two nuts together on the same thread is common engineering practice, so to an engineering mind, locking a nut and a dust cap together on a valve stem makes sense Perhaps not the very highest reputation sites, but lots like these: By DEATH_INC., Posted July 21, 2017 i usually wind the top one up against the valve cap once I've put it on. By Wild Alaskan, Posted July 22, 2017 Leave the bottom one on and the top for installing the tube, then discard the top one or tighten it against the valve cap to allow the tube to shift without ripping. https://thumpertalk.com/forums/topic/1235761-valve-stem-nuts/ JimVonBaden, Jun 25, 2010 tcourdin said: If you snug the stem onto the rim, and then the tire slips on the rim it will rip the tube. It's better to have the stem a bit loose. I either run no nut or run it up to the cap as your friend suggested. Nut or no nut the tire slipping on the rim will rip the tube. If that is a concern with a low tire pressure dirt bike, use rim locks. As for the two nuts, one is a lock nut to the other, both on the outside. I have never seen a valve cap fall off, so do not see what use there is in tightening a nut against the valve cap. Jim :brow https://advrider.com/index.php?threads/tire-tube-valve-stem-nut.593561/
July 17, 20187 yr my pivot bolts fall off but i have never lost a valve cap b4 ill add some lock tight just in case.
July 17, 20187 yr What ever you say Do you have a problem with what I have written ?? Or are you just being a troll
July 18, 20187 yr Do you have a problem with what I have written ?? Or are you just being a troll I was simply saying that locking two nuts together on the same thread is common in mechanical engineering. I didn't say I do it on my valve caps, merely that I understand the principal. You disagreed with me. Over 40 working in mechanical engineering has given me an understanding of how things work. I've also learned it's pointless to argue with people that don't understand. So to restore some harmony I'll agree with what ever you say.
July 18, 20187 yr I was simply saying that locking two nuts together on the same thread is common in mechanical engineering. I didn't say I do it on my valve caps, merely that I understand the principal. You disagreed with me. Over 40 working in mechanical engineering has given me an understanding of how things work. I've also learned it's pointless to argue with people that don't understand. So to restore some harmony I'll agree with what ever you say. To be fair if you had read my post it was purely about valve caps nothing else At no point did I say using double nuts was a waste of time in any other application (if not a bit out dated these days) As you don’t know what I do for a living you also can’t flame my knowledge in the field and to add to that I’m also not getting into a pissing competition with you about who knows the most, So let’s leave it as a miscommunication and get on with life
July 18, 20187 yr To be fair if you had read my post it was purely about valve caps nothing else At no point did I say using double nuts was a waste of time in any other application (if not a bit out dated these days) As you don’t know what I do for a living you also can’t flame my knowledge in the field and to add to that I’m also not getting into a pissing competition with you about who knows the most, So let’s leave it as a miscommunication and get on with life I agree a miscommunication. I will say I use a double locknut every day when setting depths on my drilling machine also use a double nut setting the workpiece position on my laser welder, saying that I'm also out of date. Let's not worry about it, in 100 years we'll all be dead and forgotten , ( a lot sooner in my case;) )
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