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tire tube has 2 nuts #669702
10/01/16 4:33 pm
10/01/16 4:33 pm
Joined: Sep 2007
Posts: 149
Seattle
D
Douglass Harroun Offline OP
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Posts: 149
Seattle
The tube stem has two nuts supplied, and a dished washer. Should I use both nuts, one on each side of rim? The washer against the rubber?

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Re: tire tube has 2 nuts [Re: Douglass Harroun] #669703
10/01/16 4:59 pm
10/01/16 4:59 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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Both nuts, locked together outside the rim, halfway up the visible part of the valve..


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: Douglass Harroun] #669717
10/01/16 7:49 pm
10/01/16 7:49 pm
Joined: Dec 2002
Posts: 3,262
arkansas
L
leon bee Offline
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arkansas
I throw one nut in the pile, use other outside rim.

Re: tire tube has 2 nuts [Re: Douglass Harroun] #669961
10/04/16 6:32 am
10/04/16 6:32 am
Joined: Oct 2003
Posts: 11,267
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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North Georgia, USA
One nut against the sealing washer on the inside of the rim.
One nut on the outside of the rim.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: tire tube has 2 nuts [Re: RF Whatley] #669963
10/04/16 6:44 am
10/04/16 6:44 am
Joined: Dec 2013
Posts: 4,513
ohio, usa
kevin roberts Offline

DOPE
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ohio, usa
one on the outside valve stem, the other on your keychain for when the first falls off.


"Are bikes so nice as all that?" asked the mole, shyly...

"Nice? They're the only thing," said the Water Rat Solemnly, as he leaned forward on the handlebars. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about with bikes."
Re: tire tube has 2 nuts [Re: Douglass Harroun] #669974
10/04/16 9:20 am
10/04/16 9:20 am
Joined: Jan 2014
Posts: 2,234
South cone
R
reverb Offline
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South cone
...if you put a nut inside the rim you ll have kind of a space when inflate the tire, making more prone to puncture or failure and that s not good in my book

Re: tire tube has 2 nuts [Re: Douglass Harroun] #669994
10/04/16 12:46 pm
10/04/16 12:46 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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scotland
This is attributed to an email from Michelin, on an Ariel forum:

Quote
The conical washer sits over the inner tube valve stem and should follow the contour of the valve so that the convex side sits against the wheel rim when fitting.

Once fitted to the wheel the two lock nuts sit on the valve cap side of the wheel rim. After fitment and inflation to the correct pressure, the two nuts should be backed up towards the valve cap, and locked against each other.

This is not usually an issue on correctly inflated road going tyres, but should there be any slippage of tyre on the rim, during heavy braking or acceleration for example, the inner tube could be pulled around slightly with the tyre and if the inner tube is bolted to the rim the valve can be ripped out. If the lock nuts are raised towards the valve cap then inner tube has some leeway to move before this happens. Any movement is thus obvious as the valve stem will no longer be straight and pointing at the centre of the hub, but will be pulled round at an angle.


http://forum.arielownersmcc.co.uk/viewtopic.php?t=3880&start=10#p25405[/quote]



[Linked Image]

Last edited by triton thrasher; 10/04/16 1:06 pm.
Re: tire tube has 2 nuts [Re: RF Whatley] #669997
10/04/16 12:58 pm
10/04/16 12:58 pm
Joined: Jul 2001
Posts: 13,012
Central Virginia
Lannis Offline

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Lannis  Offline

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Central Virginia
Originally Posted by RF Whatley
One nut against the sealing washer on the inside of the rim.
One nut on the outside of the rim.


I recognize you as the expert, but are you really sure about that?

What could possibly be the function of a nut inside the rim?

Why is the dished washer on the tube a really good fit for the rim, but is awkward and grossly out of place against a hex nut?

Why isn't the inside nut a "stress point" for the tube?

Lannis


I stopped believing for a little while this morning. Journey is really going to be upset.
Re: tire tube has 2 nuts [Re: Douglass Harroun] #670002
10/04/16 1:50 pm
10/04/16 1:50 pm
Joined: Feb 2008
Posts: 4,574
New Jersey USA
Tridentman Offline

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Many thanks, TT, that is extremely helpful and also makes a lot of sense.
Sometimes acerbic wit and sometimes very helpful info --this guy is quite a Scotsman!

Re: tire tube has 2 nuts [Re: Douglass Harroun] #670007
10/04/16 2:05 pm
10/04/16 2:05 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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An engineer guy at work bought an oil in frame 650 Tiger. He's such a perfectionist he emailed Michelin about the two nuts and that's what they replied with.

At least, so he says. I don't think I've actually seen the reply.....


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: Douglass Harroun] #670022
10/04/16 4:04 pm
10/04/16 4:04 pm
Joined: Oct 2006
Posts: 2,911
Elburn, Ill. USA
I
Irish Swede Offline
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I thought the entire purpose of the second nut is to lock the first one in place, and the purpose of the first nut is to lock the valve stem in place onto the rim.

Also, if the tube has been properly lubricated with talc or chalk when it's installed, how can any slippage of the tire on the rim grip the tube enough to rip out the valve stem?

Re: tire tube has 2 nuts [Re: Irish Swede] #670024
10/04/16 4:35 pm
10/04/16 4:35 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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Originally Posted by Irish Swede
the purpose of the first nut is to lock the valve stem in place onto the rim.


Yes, while you're fitting a new tyre and tube.




Quote
Also, if the tube has been properly lubricated with talc or chalk when it's installed, how can any slippage of the tire on the rim grip the tube enough to rip out the valve stem?


Ok, the tyre goes round and round, leaving the tube in one place. You should do some controlled experiments.

Or argue it out with the makers.


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: Douglass Harroun] #670034
10/04/16 6:45 pm
10/04/16 6:45 pm
Joined: Apr 2002
Posts: 716
Out There!
N
Nick Offline
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Out There!
Does anyone really believe that that little nut on the valve stem is going to 'hold the tube in place' if the tire slips on the rim? Some folks just have to learn the hard way.

The only thing a nut is needed for is for preventing the stem from slipping inside the tire when mounting the tire on the rim and when pushing the stem inwards to allow the tire to properly seat on the rim.

Speedway bikes have an elegant solution: the stem protrudes not from the rim, but from the tire sidewall and has a 90 bend in it (at least they did the last time I went to a speedway race).


When people who should have known better cautioned me about the dangers of motorcycle racing, I always told them that a fear of death is nothing more than a fear of life in disguise.
Re: tire tube has 2 nuts [Re: RF Whatley] #670036
10/04/16 7:18 pm
10/04/16 7:18 pm
Joined: Aug 2014
Posts: 1,776
OZ
Triless Online content
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OZ
I've always done what RF says, except I use the outside nut, finger tight, to lock the steel valve caps I use.
Its amazing the amount of people who "help " by screwing the nut back down to the rim !

Re: tire tube has 2 nuts [Re: ] #670069
10/05/16 3:26 am
10/05/16 3:26 am
Joined: Aug 2014
Posts: 1,776
OZ
Triless Online content
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OZ
Good grief ! That explains it all. Needles has thrown his nuts away !!
Seriously, in this day and age would tyre manufacturers cling to hangovers from pushbike days ! Those nuts are obviously still supplied for a reason !
I agree with RF as to the placement of those nuts.

Re: tire tube has 2 nuts [Re: Triless] #670116
10/05/16 12:45 pm
10/05/16 12:45 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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Originally Posted by Triless

I agree with RF as to the placement of those nuts.


And you'll probably get off with it.

Be wary of putting a nut inside the rim for a customer though, now that you know better.


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: triton thrasher] #670147
10/05/16 5:59 pm
10/05/16 5:59 pm
Joined: Aug 2014
Posts: 1,776
OZ
Triless Online content
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OZ
Well, TT, I've been fitting tubes to my bikes the way I was shown all those years ago.And, thus far, haven't had any problem. When I was operating, I only did service work and some engine rebuilds on motorcycles.
Although I change my own tyres I stayed away from that aspect re customers.Actually,the bulk of my work was with stationary engines. No call for tyre changing there !
But, one things for sure, I'll be having a bit of a think now !

Re: tire tube has 2 nuts [Re: Douglass Harroun] #670162
10/05/16 6:49 pm
10/05/16 6:49 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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scotland
I haven't seen tube damage obviously caused by any placement of nuts.

Tubes are fairly tough and most owners don't keep them too long (I hope).


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: Douglass Harroun] #670226
10/06/16 8:11 am
10/06/16 8:11 am
Joined: May 2013
Posts: 5,082
Rotherham - S. Yorkshire
Allan Gill Offline

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Rotherham - S. Yorkshire
I fit mine as shown on the Ariel note above, I used to lock both against the rim until my off roading pal told me that the valve could rip out before I even know the tube had shifted, and that if i lock the nuts by the cap I could quickly inspect the valve and see if the tube has moved or not.


beerchug
Re: tire tube has 2 nuts [Re: Lannis] #670232
10/06/16 8:49 am
10/06/16 8:49 am
Joined: Oct 2003
Posts: 11,267
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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North Georgia, USA
Originally Posted by Lannis
Originally Posted by RF Whatley
One nut against the sealing washer on the inside of the rim.
One nut on the outside of the rim.


I recognize you as the expert, but are you really sure about that?

What could possibly be the function of a nut inside the rim?

Why is the dished washer on the tube a really good fit for the rim, but is awkward and grossly out of place against a hex nut?

Why isn't the inside nut a "stress point" for the tube?

Lannis


I always considered the stem as a separate piece from the tube, and that the washer and first nut were a mechanical backup system in case the bonding between the 2 parts was faulty.

The described stack-up was what I was shown during my professional training in 1966. Every customer and personal tire I've changed since then (which must by now number in the thousands) has been fitted that way with no known failures.

I will point out that the outside nut is left loose (just spun on), because if the tire does slip on the rim, the angle of the valve stem will be the first indicator of trouble, well before the stem is ripped away from the tube. This is important because punctures can be repaired on the road side, but once the stem is ripped free of the tube, replacement is mandatory.

However, being an old dog that's still able to learn new tricks, I'm rethinking the stack-up based on the Michelin memo. You're never too old to learn !

:bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: tire tube has 2 nuts [Re: Douglass Harroun] #670234
10/06/16 9:07 am
10/06/16 9:07 am
Joined: Mar 2013
Posts: 357
Irene, South Africa
robcurrie Offline
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Irene, South Africa
It's difficult to push on the air nozzle if the valve is not held steady in the rim with a nut, especially if the tyre is flat.

Rob C

Re: tire tube has 2 nuts [Re: Douglass Harroun] #670262
10/06/16 12:41 pm
10/06/16 12:41 pm
Joined: Aug 2001
Posts: 7,636
scotland
triton thrasher Online content
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Wonder if we'd get a different answer from Dunlop, or Pneumant.


Amateur Loctite enthusiast.
Re: tire tube has 2 nuts [Re: triton thrasher] #670273
10/06/16 2:50 pm
10/06/16 2:50 pm
Joined: Sep 2013
Posts: 1,789
Pacific northwest
Q
quinten Online confused
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Pacific northwest

Ok ,
It looks like we're all on the same page ... no one is putting 2 nuts under the rim

.


Moderated by  Alan_nc 


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