air travel and suspension

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tugger
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Joined: Thu Jan 07, 2010 11:56 am

air travel and suspension

Postby tugger » Sun Jan 27, 2013 11:26 am

Hi guys,

I am off to Spain in a few weeks and wondered if anyone has any experience as to whether it is necessary to let out air of suspension and shocks?

I am getting the impression that it isnt really but some people do to be on the safe side...?

Anyone with any knowledge greatly appreciated
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nicklouse
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Re: air travel and suspension

Postby nicklouse » Sun Jan 27, 2013 12:01 pm

totally unnecessary.
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nferrar
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Re: air travel and suspension

Postby nferrar » Mon Jan 28, 2013 12:10 pm

Yeah not needed and I don't for tyres although I must confess I did for my shocks last time - more just slight peace of mind (although holds are pressurised they won't be identical to sea level) I figured it was much easier to inflate the shocks again at the destination rather than find replacement shocks. If I'd forgotten to though I wouldn't have panicked...

WhipIt
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Joined: Tue Jan 10, 2012 13:54 pm

Re: air travel and suspension

Postby WhipIt » Mon Jan 28, 2013 12:43 pm

Passenger aircraft typically cruise at 30~40k feet, but the cargo holds are pressurised to an equivalent altitude of <8k feet (http://en.wikipedia.org/wiki/Cabin_pressurization).

The pressure drop at 8k feet is ~3.8 PSI (http://www.engineeringtoolbox.com/air-a ... d_462.html). This is like adding 3.8 PSI to your fork/tyres. Even at 40k feet it's only ~12 PSI.

3.8 PSI is not going to blow tyres or suspension unless they're already over-inflated!

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The Rookie
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Re: air travel and suspension

Postby The Rookie » Mon Jan 28, 2013 12:53 pm

Even if the hold was a perfect vacuum (going to the moon?) it would only add 14.7 psi to the guage pressure in suspension and tyres.

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chez_m356
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Joined: Wed Oct 28, 2009 20:04 pm

Re: air travel and suspension

Postby chez_m356 » Mon Jan 28, 2013 14:30 pm

The Beginner wrote:Even if the hold was a perfect vacuum (going to the moon?) it would only add 14.7 psi to the guage pressure in suspension and tyres.

    has anyone else ever wondered, how he knows so much ? :wink:
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Levi_501
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Joined: Wed May 06, 2009 19:05 pm

Re: air travel and suspension

Postby Levi_501 » Mon Jan 28, 2013 14:41 pm

We have talked this many a time.

Whilst I tend to agree with the above, I always drain the air out of tubes and suspension.



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