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Nuts on inner tubes

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Laverdaroo:
One in one out to lock it is the way I’ve always done it too. My XL used to chew inner tubes doing one in and one out so swapped to both out. No issues since….


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AshimotoK0:
There are 2 nuts so that you lock them together and leave a small gap between rim and the 1st nut

nairb:
One nut in, the other out has worked well for years.  Or has seemed too.  The only flat tyres have been due to nails/screws etc. 
I have seen other ways of securing the valve or using the two nuts.  Example below....
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I had not seen the alternative way or had it mentioned......
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The new setup that failed was on a 750 parallel twin with loads of torque, which used two tyre locks to keep the tyre in place.  Maybe they failed.  I dont know.
I will try the 2nd pic method and check that those tyre locks do actually grip and hold the tyre.

Trigger:
The original fitting was a 5mm thin nut on the inside with a thumb nut with a recess as in picture.

Just had look at a new inner tube and the nuts are 4mm thick and a standard thin wall spanner is 4.5mm thick so, you would have to find a thinner spanner to lock the nuts together  ;)


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K2-K6:
Years ago, weren't the valve stem arranged with flange on inner end, push through small hole in tube, then secured with external washer with a nut there to hold that assembly tight  ? Making it std to have nut on inside of rim. Now they are all glued in situ to make that clamp redundant. 

The washer to generally stop the tube fretting against any poor areas inside the rim around that location on motorcycle tubes.

Anyway, I've never clamped the external nut tight whatever the arrangement as it will always indicate there's some movement by leaning the valve over that may need another look at it to find out what's going on inside. Bolted tight to rim, it'll pull the tube off the valve without any warning if it moves much.

I think the washer on them nowadays is dished so that some movement can take place without risk of compromise to tube straight away. Tgey are usually very smooth finish to not present any "cutting" edges to the tube material.

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