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Old 11-13-2012, 05:33 PM   #6852
eNx
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Member#: 268580
Join Date: Dec 2010
Chapter/Region: NWIC
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Quote:
Originally Posted by EnzyteBob View Post
i got a really good deal on a set of rims recently because they had two valve stem holes per rim (factory defect). when i was getting tires put on last weekend:

guy at the shop: yo man you know these have 2 valve stem holes on each rim?!

me: yeah...

guy: is there like, a reason for that? like weight or aerodynamics or something? just curious man i ain't seen nothing like this before! it's crazy!

me, losing my patience: brah, you just don't understand! these are racing rims, brah!

i took off before he could further damage my IQ with more of his questions. because clearly two valve stems takes off 30 pounds of weight and streamlines the air flow over the entire car
http://blog.tirerack.com/blog/yokoha...kosei-k1-wheel

[quote]
Our Kosei K1 TS has two valve stems and many customers ask why. They are located 180 degrees from each other. In racing, many teams use nitrogen. Nitrogen has larger molecules than ambient air and is less likely to "seep" through the pores in all tires.

It also is less sensitive to temperature so the psi stays more even as the tire heats and cools with track use.


The two valve stems help in exchanging ambient air for Nitrogen. One stem is used to bleed off the ambient air while nitrogen is put in the opposite stem.
It's a popular look in Japan and was requested by many of Kosei's customers.




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