I put close to 120 lbs in each of my 700x23 clinchers, and I have to air the tires every two or three days because the butyl tubes tend to lose a tiny bit of air each day (real rubber tubes lose A LOT of pressure each day). But has anyone who pressures their tires in this range ever noticed that the tires act like barometers? When it's sunny, you need to put in more air to top up the tires, since the good weather means you're in a high pressure area, so the tires require more internal pressure to resist ambient pressure. Conversely, on rainy days, when the atmospheric pressure is low, you don't need to pressurize the tires as much. Any physicists out there to set me straight?
- L.