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Author Topic: Tire Pressure  (Read 2536 times)

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muddypaws

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Tire Pressure
« on: March 13, 2012, 08:21:39 PM »
Just thought I would check the tire pressure after a 30 mile trip. The pressure went up 7 psi in both front and rear. They had correct pressure when cold.
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Bill

FLSTFI Dave

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Re: Tire Pressure
« Reply #1 on: March 13, 2012, 08:26:16 PM »
Charles's law will explain it.

Air pressure will go up as you heat the air.  That is why they say inflate to xx when cold.

Ever notice a top fuel cars back tires get taller during the launch?  Air expands during the burning rubber.

« Last Edit: March 13, 2012, 08:30:56 PM by FLSTFI Dave »
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SBB

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Re: Tire Pressure
« Reply #2 on: March 13, 2012, 08:36:12 PM »
Quote from: FLSTFI Dave on March 13, 2012, 08:26:16 PM
Charles's law will explain it.

Air pressure will go up as you heat the air.  That is why they say inflate to xx when cold.

Ever notice a top fuel cars back tires get taller during the launch?  Air expands during the burning rubber.



 :nervous:

And I always thought it was centrifugal force.

 :nixweiss: :nixweiss: :nixweiss: :nixweiss:

SBB
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Re: Tire Pressure
« Reply #3 on: March 13, 2012, 09:15:37 PM »
Quote from: SBB on March 13, 2012, 08:36:12 PM
:nervous:

And I always thought it was centrifugal force.

 :nixweiss: :nixweiss: :nixweiss: :nixweiss:

SBB

And all this time I thought it was that they were flat so didn't wear a bra to hold them up :nixweiss: ?
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2harleys

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Re: Tire Pressure
« Reply #4 on: March 13, 2012, 10:53:54 PM »
Quote from: Twolanerider on March 13, 2012, 09:15:37 PM
And all this time I thought it was that they were flat so didn't wear a bra to hold them up :nixweiss: ?

Maybe they are just "excited" to get to the end of the track??
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kiwihog

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Re: Tire Pressure
« Reply #5 on: March 13, 2012, 11:05:15 PM »
Quote from: SBB on March 13, 2012, 08:36:12 PM
:nervous:

And I always thought it was centrifugal force.

 :nixweiss: :nixweiss: :nixweiss: :nixweiss:

SBB
X 2
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SilveRT8

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Re: Tire Pressure
« Reply #6 on: March 14, 2012, 12:21:37 AM »
Quote from: SBB on March 13, 2012, 08:36:12 PM
:nervous:

And I always thought it was centrifugal force.

 :nixweiss: :nixweiss: :nixweiss: :nixweiss:

SBB

It is !
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FLSTFI Dave

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Re: Tire Pressure
« Reply #7 on: March 14, 2012, 08:37:48 PM »
Quote from: SBB on March 13, 2012, 08:36:12 PM
:nervous:

And I always thought it was centrifugal force.

 :nixweiss: :nixweiss: :nixweiss: :nixweiss:

SBB
You are correct with respect to the drag car tires, it is the centrifugal force.

I guess I wrongly applied Charles's law.

I have had three rim and tire makers tell me when going to the 21 on my bike I had to take into account tire expansion due to heat for front fender placement.
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MKW

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Re: Tire Pressure
« Reply #8 on: April 03, 2012, 06:32:58 PM »
What about Nitrogen???  Just kidding, I know everyone gets their panties in a bunch talking about nitrogen vs air.  ;D
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grc

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Re: Tire Pressure
« Reply #9 on: April 03, 2012, 06:35:11 PM »
Quote from: MKW on April 03, 2012, 06:32:58 PM
What about Nitrogen???  Just kidding, I know everyone gets their panties in a bunch talking about nitrogen vs air.  ;D

I didn't know it was nitrogen versus air.  Nitrogen is the largest component of air.


Jerry ;)
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dlaws01

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Re: Tire Pressure
« Reply #10 on: April 03, 2012, 10:24:06 PM »
Nitrogen is introduced dry and is more stable to pressure changes due to temperature variations, and because of the lack of an oxidizer ( O2 ), is less prone to accelerate deterioration of the rubber. ( internal dry rot ) 
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dlaws01

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Re: Tire Pressure
« Reply #11 on: April 03, 2012, 10:26:08 PM »
Like anybody keeps tires on their bike long enough for them to rot!   :beatdeadhorse:
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MKW

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Re: Tire Pressure
« Reply #12 on: April 03, 2012, 11:12:40 PM »
Quote from: grc on April 03, 2012, 06:35:11 PM
I didn't know it was nitrogen versus air.  Nitrogen is the largest component of air.


Jerry ;)

I hear ya Jerry.  About 78% by volume  ;)  You post are informative and have a great sense of humor-Thanks  ;D
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