two valve stems on nascar tires. why?

two valve stems on nascar tires. why?

Post by scot.. » Mon, 24 Jul 1995 04:00:00


While at Daytona at the Pepsi-400 in the pits,I noticed that there
were two valve stems on the tires.  What is the reason for this? Is
there tubes in the tires, or more than one air compartment?  Just
wandering.

 
 
 

two valve stems on nascar tires. why?

Post by John D. M » Mon, 24 Jul 1995 04:00:00

One is to put air in. The other is to bleed air out when the
pressure goes higher than the driver wants it.

 
 
 

two valve stems on nascar tires. why?

Post by Randy G. Feaki » Mon, 24 Jul 1995 04:00:00


Quote:
>One is to put air in. The other is to bleed air out when the
>pressure goes higher than the driver wants it.

 One is for the inter tire that is used at the super speedways, if the car
has a flat at 200MPH the inter tire will give the driver some control of
the car instead of trying to ride on a completely flat tire.

 Randy

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two valve stems on nascar tires. why?

Post by Roger L Smi » Mon, 24 Jul 1995 04:00:00

Quote:

>While at Daytona at the Pepsi-400 in the pits,I noticed that there
>were two valve stems on the tires.  What is the reason for this? Is
>there tubes in the tires, or more than one air compartment?  Just
>wandering.

If you wander too far, you won't be able to read my response!!

At some tracks, the cars run an "inner-liner".  This is kind of like the
little mini spare tire that many cars come with today.  The inner-liner
keeps the car from running on the rim if the tire blows out.  It is just an
emergency device that may keep the car from hitting the wall, and it allows
the driver to (hopefully) make it back to the pits.

Quote:
><><><><><><><><> NASCAR - Everything else is just a game! <><><><><><><><><



CS Dept. Asst. Systems & Network    44 Link to racing images from my webpage
Manager                             94     http://www2.msstate.edu:80/~rls3/
Quote:
><><><><><><><><><><><><><>< Go fast, turn left ><><><><><><><><><><><><><><

 
 
 

two valve stems on nascar tires. why?

Post by Clark and Cheryl Wood » Tue, 25 Jul 1995 04:00:00

Quote:

>While at Daytona at the Pepsi-400 in the pits,I noticed that there
>were two valve stems on the tires.  What is the reason for this? Is
>there tubes in the tires, or more than one air compartment?  Just
>wandering.

One is for the inner liner and the other is for the tire.
 
 
 

two valve stems on nascar tires. why?

Post by Doug Swans » Wed, 26 Jul 1995 04:00:00



Quote:

>While at Daytona at the Pepsi-400 in the pits,I
noticed that there
>were two valve stems on the tires.  What is the
reason for this? Is
>there tubes in the tires, or more than one air
compartment?  Just
>wandering.

The two valve stems are for the (1) innerliner and (2)
the tire. Innerliners (a tire within the tire) are
required at several tracks including all
superspeedways. At short tracks like Martinsville
where innerliners are not used, the second valve stem
is just not used, although it it still there because
the wheels have two valve stem holes.

Doug Swanson

 
 
 

two valve stems on nascar tires. why?

Post by Rand » Fri, 28 Jul 1995 04:00:00

Quote:

>While at Daytona at the Pepsi-400 in the pits,I noticed that there
>were two valve stems on the tires.  What is the reason for this? Is
>there tubes in the tires, or more than one air compartment?  Just
>wandering.

I think they are tubeless tires but that one of them is for the inner liner.
NASCAR has a rule that the tires must have an inner liner such that if a
tire blows the driver is still able to keep some control.  So I would assume
that one stem is for the inner liner, and the other is for the remainder of
the tire.

Randy