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#22
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What size nut goes onto a typical US passenger tire Schrader valve?
Steve W. wrote on Wed, 07 Dec 2016 04:08:41 -0500:
> Easily. To remove the old one you just cut the inside section off. That > keeps you from trying to reuse an old stem. > Next take the new stem, coat it with either tire lube or some very soapy > water and put it through the hole, then pull with the 4 way while moving > your hand in a circle (not turning the valve). It will pull right into > place. Thank you for that advice as it's not obvious that the tiny $2 four-way tool is good enough considering my searches found a bunch of tools for removing and replacing automotive tubeless tire valve stems from a. Cable pullers b. Grooved hinged levers c. Hook-and-funnel tools (these work without breaking the bead though) d. And the inexpensive 4-way tool I have the rubber and brass style but is it different for the style that has metal nuts or similar? |
#23
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What size nut goes onto a typical US passenger tire Schrader valve?
Scott Dorsey wrote on 6 Dec 2016 16:45:21 -0500:
>>Assuming "Imperial" means "USA", that would mean I need a 32 TPI nut >>somewhere between 0.271 inches and 0.305 inches in iD, but that doesn't >>seem to be a standard size for a USA nut. > > Sure isn't, that's deliberate. I keep seeing this *mix* of metric and what they seem to call "Imperial", (which I guess is the USA?). Are we really that imperial? Anyway, I'm confused about this mix of metric and US measurements. I realize that car tires have both at the same time but for different things. For example, the P250/50R18 designation is a mix of units for different measurements 1. P = passenger 2. 250 = millimeters of tread width 3. 50 = percent width being the height in millimeters 4. R = radial 5. 18 = diameter in inches So they mix letters, percents, millimeters, and inches but each one designates a different measurement. Is it the same with the mix of units on the Schrader valve threads? The reason I ask is that there are only two measurements: 1. Nominal diameter (thread root & thread crown) 2. Threads per measurement unit Given there are only really two measurements on a valve stem nut selection, I thought the two lines in the Wikipedia weren't a mix but just two ways of measuring the same thing? Aren't these two different measurements measuring the same thing? 1. Metric: 7.7 mm OD, 6.9 mm thread root, 0.794 mm pitch 2. USA: 0.305 in OD, 0.271 in thread root, 32 TPI pitch Right? That means it's *not* a mix. It's just like measuring a 5/32 and 4mm bolt, where both use the same wrech. My question is: Isn't the tire valve NOT a mix of measurement standards? |
#24
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What size nut goes onto a typical US passenger tire Schradervalve?
Leon Schneider wrote:
> wrote on Wed, 07 Dec 2016 08:02:40 -0500: > >> Remove with a utility knife, install with the tool. Soap the stem >> first. > > Thanks for confirming that the cheap tool works just fine. > > As you probably know, experience in choosing tools is everything because > ometimes you don't want the cheap tool, and sometimes you do. > > It all depends, usually, on three basic things for all tools: > 1. Use the cheap tool if it does the job well enough to do it right > 2. Buy the expensive "finesse" tools if you do it a lot > 3. The smaller and easier stored the tool, the better (for storage reasons) > > This 4-way cheap ubiquitous tool meets the standard tool's #1 and #3 > criteria, and since I'm not doing the job a lot, I don't need to meet the > #2 criterion for "elegant" tools. If you're going to be doing tens, hundreds, or thousands of wheels then get the best tool that you can afford. Usually that means the most expensive. |
#25
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What size nut goes onto a typical US passenger tire Schradervalve?
Leon Schneider wrote:
> Ralph Mowery wrote on Wed, 7 Dec 2016 09:59:24 -0500: > >> Yes, just lube it with something. >> >> They do make valve stems that instead of a friction fit that have a nut >> on the outside so the valve stem fits on like a bolt. > > I have seen those nut-type valve stems in the stores, and I read while I > looked this up that alloy wheels often use them. > > I have steel wheels so I'll use the rubber but is the procedure the same > for the nut-type? > > Or do you just unscrew them and they fall out and you screw them and they > go in (without any special tools)? Some alloy wheels and all large trucks use the nut type. They just unscrew, but they rarely need replacing unless obviously damaged. |
#26
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What size nut goes onto a typical US passenger tire Schrader valve?
Leon Schneider > wrote:
>Scott Dorsey wrote on 6 Dec 2016 16:45:21 -0500: > >>>Assuming "Imperial" means "USA", that would mean I need a 32 TPI nut >>>somewhere between 0.271 inches and 0.305 inches in iD, but that doesn't >>>seem to be a standard size for a USA nut. >> >> Sure isn't, that's deliberate. > >I keep seeing this *mix* of metric and what they seem to call "Imperial", >(which I guess is the USA?). > >Are we really that imperial? No, Imperial measures are not the same as US measures. An Imperial pint is 0.57 litres, while a US liquid pint is 0.47 litres. US measures, Imperial measures, and English measures are all different. >So they mix letters, percents, millimeters, and inches but each one >designates a different measurement. That's how it goes. I've seen pressure gauges in pounds/cm2, even. We live in that kind of world. >Aren't these two different measurements measuring the same thing? >1. Metric: 7.7 mm OD, 6.9 mm thread root, 0.794 mm pitch >2. USA: 0.305 in OD, 0.271 in thread root, 32 TPI pitch > >Right? >That means it's *not* a mix. It depends how the original document specifies it. But you could think about it either way if you were setting a lathe up. >My question is: >Isn't the tire valve NOT a mix of measurement standards? I don't know, I haven't read the original specification document. It's likely written in terms of ordinary US standards, given when and where it came about. It's not a standard SAE thread, but then there are an infinite number of possible threads and only a very few of them are standard SAE threads. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#27
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What size nut goes onto a typical US passenger tire Schradervalve?
On 12/7/2016 12:33 PM, Scott Dorsey wrote:
> Leon Schneider > wrote: >> Scott Dorsey wrote on 6 Dec 2016 16:45:21 -0500: >> >>>> Assuming "Imperial" means "USA", that would mean I need a 32 TPI nut >>>> somewhere between 0.271 inches and 0.305 inches in iD, but that doesn't >>>> seem to be a standard size for a USA nut. >>> >>> Sure isn't, that's deliberate. >> >> I keep seeing this *mix* of metric and what they seem to call "Imperial", >> (which I guess is the USA?). >> >> Are we really that imperial? > > No, Imperial measures are not the same as US measures. An Imperial pint is > 0.57 litres, while a US liquid pint is 0.47 litres. > > US measures, Imperial measures, and English measures are all different. > >> So they mix letters, percents, millimeters, and inches but each one >> designates a different measurement. > > That's how it goes. I've seen pressure gauges in pounds/cm2, even. We > live in that kind of world. > >> Aren't these two different measurements measuring the same thing? >> 1. Metric: 7.7 mm OD, 6.9 mm thread root, 0.794 mm pitch >> 2. USA: 0.305 in OD, 0.271 in thread root, 32 TPI pitch >> >> Right? >> That means it's *not* a mix. > > It depends how the original document specifies it. But you could think about > it either way if you were setting a lathe up. > >> My question is: >> Isn't the tire valve NOT a mix of measurement standards? > > I don't know, I haven't read the original specification document. It's > likely written in terms of ordinary US standards, given when and where it > came about. > > It's not a standard SAE thread, but then there are an infinite number of > possible threads and only a very few of them are standard SAE threads. > --scott > Right and Schrader (1890-ish) predates SAE anyway. Prior standards were UNC/UNF, before that NC/NF and before that Whitworth 55 degree threads in an era when many manufacturers of many things made up thread formats as they went along. -- Andrew Muzi <www.yellowjersey.org/> Open every day since 1 April, 1971 |
#28
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What size nut goes onto a typical US passenger tire Schrader valve?
On Wed, 7 Dec 2016 09:59:24 -0500, Ralph Mowery
> wrote: >In article >, >says... >> >> RonNNN wrote on Tue, 6 Dec 2016 15:39:37 -0600: >> >> > 4-way valve stem tools cost less than $2. It amazes me why some people >> > want to reinvent some things. >> >> Assuming the tire is off the rim, can I both remove an old valve and >> replace it with a new valve using that cheap 4-way tool? > >Yes, just lube it with something. > >They do make valve stems that instead of a friction fit that have a nut >on the outside so the valve stem fits on like a bolt. > I use "bolt in" stems on all of my vehicles now since I lost 4 stems in one trip on my PT Cruiser. That was Kitchener to PEI and back. |
#29
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What size nut goes onto a typical US passenger tire Schrader valve?
On Wed, 7 Dec 2016 16:59:12 -0000 (UTC), Leon Schneider
> wrote: >Ralph Mowery wrote on Wed, 7 Dec 2016 09:59:24 -0500: > >> Yes, just lube it with something. >> >> They do make valve stems that instead of a friction fit that have a nut >> on the outside so the valve stem fits on like a bolt. > >I have seen those nut-type valve stems in the stores, and I read while I >looked this up that alloy wheels often use them. > >I have steel wheels so I'll use the rubber but is the procedure the same >for the nut-type? > >Or do you just unscrew them and they fall out and you screw them and they >go in (without any special tools)? You got'er Cotter. Just tighten with a socket wrench. |
#30
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What size nut goes onto a typical US passenger tire Schrader valve?
On Wed, 7 Dec 2016 16:59:34 -0000 (UTC), Leon Schneider
> wrote: >Scott Dorsey wrote on 6 Dec 2016 16:45:21 -0500: > >>>Assuming "Imperial" means "USA", that would mean I need a 32 TPI nut >>>somewhere between 0.271 inches and 0.305 inches in iD, but that doesn't >>>seem to be a standard size for a USA nut. >> >> Sure isn't, that's deliberate. > >I keep seeing this *mix* of metric and what they seem to call "Imperial", >(which I guess is the USA?). > >Are we really that imperial? Imperial is referring to the british system, which you yanks have hung onto with so much love since the revolution, and the britts have pretrty much replaced with Metric. > |
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