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Not wishing to start a tyre thread, but ..........

kiwi dave

kiwi dave

GT Reference
Joined
Oct 28, 2008
Messages
2,230
Location
Auckland, New Zealand
I'm currently traveling at higher altitudes, 8,000 - 10,000 feet above sea level. When I went to check the tyre pressures, I found they measured a lot higher than the amount I set them to at sea level. Two questions:-

1. Should I reduce the pressures to read the correct values?

2. Can I trust my pressure gauge to be accurate at high alititudes?

In the meantime, I'm leaving them alone. Any input appreciated.
 
Re:Not wishing to start a tyre thread, but .......

What keeps your tire on is the delta in pressure between the air inside and the air outside. THe gauge reads this delta -ie. zero is not really zero but the local atmospheric pressure (1 bar at sea level). The higher you go the lower the outside pressure and assuming the air inside the tire is at the same pressure. the greater the delta between the inside and outside air.

Higher air pressure means a stiffer sidewall so less traction and more bumps and if it exceeds a certain value potential failure. So yes your tyre gauge will read right as it is really reading the delta and yes reduce the pressure to what works for the bike at sea level.

ChrisR
 
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