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air travel and suspension

tuggertugger Posts: 122
edited January 2013 in MTB workshop & tech
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
All about the aggregation of marginal gains (or marginal losses, depending on who you are!!)

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    totally unnecessary.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • nferrarnferrar Posts: 2,511
    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...
  • WhipItWhipIt Posts: 52
    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!
  • The RookieThe Rookie Posts: 27,802
    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.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • chez_m356chez_m356 Posts: 1,893
    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:
      2990506527_c36d1a4434.jpg
      Specialized Hardrock Sport Disc 10- CANYON Nerve AM 6 2011
    • Levi_501Levi_501 Posts: 1,105
      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.
    • The RookieThe Rookie Posts: 27,802
      Thanks Chez.... I think!

      Levi - stop being a wuss!
      Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
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