Thread: Deflating tyres between rides
View Single Post
Old 02-13-07 | 03:35 PM
  #30  
Sheldon Brown's Avatar
Sheldon Brown
Gone, but not forgotten
Sheldon Brown Memorial - Titanium
20 Anniversary
 
Joined: Jul 2002
Posts: 2,301
Likes: 12
From: Newtonville, Massachusetts

Bikes: See: http://sheldonbrown.org/bicycles

Originally Posted by cyccommute
Temperature can have a large effect on pressure, depending on how close you are to the maximum pressure that the tire can hold (not the list one but the true maximum). Pressure and temperature have an inverse relationship so a small increase in temperature can cause a much larger increase in pressure. You can calculate the amount of pressure rise using Gay-Lussac's law

P/T=k or P1T2=P2T1

(T has to be in Kelvin)
A large effect? I don't think so.

If it's freezing outside and you come into a house at 20 degrees C (68 degrees F) that's only a 7% difference in pressure.

Sheldon "It Doensn't Matter" Brown
Sheldon Brown is offline  
Reply
0