Two Valve Rims?

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GarnZ
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Two Valve Rims?

Postby GarnZ » Tue Jan 23, 2018 6:17 pm

I saw a late model Honda (hatch-back I think?).
It had two valves on each wheel.
The positioning of the valves were not opposite on the rim, but rather side by side (say 6" apart).
According to Honda they must have been some type of after-market rims.
I further "Googled" and found some answers that were not satisfactory for my tiny brain!

One said it was for purging the Air from the tyre whilst replacing with more popular nitrogen.
Another was to create a vacuum in one valve stem whilst filling the other with, again, nitrogen.
Still further, another reason for the two valve system, was given "one was for manual adjusting pressure
and the other for a VTMS (Valve Tyre Monitoring System)".
Anyone have an answer?

RegardZ.



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Zedboy
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Re: Two Valve Rims?

Postby Zedboy » Tue Jan 23, 2018 10:12 pm

No idea?
Our caravan has nitrogen....only the one valve though.



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GarnZ
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Re: Two Valve Rims?

Postby GarnZ » Fri Jan 26, 2018 11:35 pm

I had the query answered in a Bmw ! series Forum ....
TWO VALVE Rims.
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Post by GarnZ » Tue Jan 23, 2018 5:14 pm

I saw a late model Honda (hatch-back I think?).
It had two valves on each wheel.
The positioning of the valves were not opposite on the rim, but rather side by side (say 6" apart).
According to Honda they must have been some type of after-market rims.
I further "Googled" and found some answers that were not satisfactory for my tiny brain!

One said it was for purging the Air from the tyre whilst replacing with more popular nitrogen.
Another was to create a vacuum in one valve stem whilst filling the other with, again, nitrogen.
Still further, another reason for the two valve system, was given "one was for manual adjusting pressure
and the other for a VTMS (Valve Tyre Monitoring System)".

RegardZ.
This query was also submitted to General BMW E87
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McTrucky
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Re: TWO VALVE Rims.
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Post by McTrucky » Wed Jan 24, 2018 7:41 am

Is it definitely a second valve hole? Could it be meant to be used by a rim lock? If it was a tubed tyre on a high performance car maybe it is to stop the wheel turning inside the tyre , and riping the valve off?
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Re: TWO VALVE Rims.
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Post by marco_polo » Wed Jan 24, 2018 8:05 am

Nitrogen purge/fill seems most likely. You can't start with a vacuum, and the original air/moisture needs to be released to get anywhere near 100% n2 fill.
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User avatarBarney McGrew
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Re: TWO VALVE Rims.
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Post by Barney McGrew » Wed Jan 24, 2018 7:19 pm

Yeah it's a race thing, one pumps nitrogen in while the other is open to allow the air out.

In normal use it's completely pointless and anyone who think's using nitrogen (even for track day use) has unfortunately fallen foul of marketing and internet hype. In high level racing it has 'some' benefits, but for normal mortals, it's a pointless exercise.

A guy on YouTube shows he uses them to simply monitor the tyre pressure with one as he fills it through the other, so just makes pumping the tyres up a bit easier, but for normal use it's just a bit of a 'ricer' thing to do.
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User avatarGarnZ
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Re: TWO VALVE Rims.
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Post by GarnZ » Wed Jan 24, 2018 8:19 pm

Thanks gents,
To answer McTrucky
Is it definitely a second valve hole? Yes, I believe So!
Could it be meant to be used by a rim lock? No too flimsy for a rim lock.
If it was a tubed tyre on a high performance car maybe it is to stop the wheel turning inside the tyre , and riping the valve off?
I don't believe the tyres had a tube or tubes, bearing in mind It was just beside me in in a parking lot

RegardZ
Gone 1974~2002, 1987~318i, 1994~318i.... . Now, 2005 E87 120i (wife), 2010 E87 120i
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