So far I have done all my cycling at altitudes less then 300 metres but I will be tackling passes over 2700 metres in Europe later this year.
My question is how much does the higher altitudes affect tyre pressure? I understand that bicycle tyres are known to explode in planes which fly at 10,000 metres. (so I will deflate the tyres when flying)
Should I let some air out to compensate for the altitude? I have my tyre pressure at 75psi which is the limit for the tyre I use. (28mm tyre) If I pump the tyres to 75psi at sea level will they still be 75psi at 2700 metres? or is the tyre pressure relative to the outside air pressure?