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Old November 19th   #1
Samir
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Dual Valve Stems?

So I saw this at the autocross last weekend:


So what is this used for? It can't be just for convenience.
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Old November 19th   #2
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I believe it has to do with Nitrogen filling. Has to do with the weight of oxygen and nitrogen and the position of the valve stems, I think.
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Old November 19th   #3
Wendell
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I have a set of those rims with dual valve stems for the Miata. Same manufacturer and design, only to fit 2nd gen Miata. Even have the red metal valve stems. Have the R-comps mounted on them. ITSFAST is mostly right. Can be used for several purposes. One is purging air our when servicing with nitrogen. The other is have an air line hooked up to one and a gage on the other for servicing, don't have to stop to check. Been also told a side benefit is 2 valve stems 180 degrees apart is better balanced needing less weights.

Last edited by Wendell; November 19th at 09:55 PM.
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Old November 20th   #4
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Very cool. I found the information on the nitrogen when I did a search, but that didn't seem like it would be the only reason for a design like this.
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Old November 25th   #5
racinfast002
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Quote:
Originally Posted by Wendell View Post
I have a set of those rims with dual valve stems for the Miata. Same manufacturer and design, only to fit 2nd gen Miata. Even have the red metal valve stems. Have the R-comps mounted on them. ITSFAST is mostly right. Can be used for several purposes. One is purging air our when servicing with nitrogen. The other is have an air line hooked up to one and a gage on the other for servicing, don't have to stop to check. Been also told a side benefit is 2 valve stems 180 degrees apart is better balanced needing less weights.
obviously the weight thing doesn't look like its working. Look at how many stick on weights are on that wheel.
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Old November 25th   #6
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Quote:
Originally Posted by racinfast002 View Post
obviously the weight thing doesn't look like its working. Look at how many stick on weights are on that wheel.
Wow, never noticed that before. And they're right by a valve stem too.
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