Even without a puncture or other defect, tires still lose pressure. There is no perfect seal. Tires can leak around the bead (junction between the tire and the rim), through the tire valve and even through the tire itself. But all of these would be very slow leaks. A friend of mine has a truck parking in the driveway. Been there for more than 5 years - still has air in the tires, but they are slowly going down.
Atmospheric changes can affect your tire pressure. Air contracts and expands with temperature. If the outside temperature drops, your tires could loose pressure. You could also have a slow leak which causes a tire to loose air over time. If you do have a leak, you can take it to a specialty tire chain which will fix it for around $25.
For more information you can check out my website which has an informative article on car maintenance.
Because of permeation, i.e. air seeping through the rubber. Tires loose more air in hot weather. CHECK your tires inflation/pressure - WHY? Since air is a gas, it expands when heated and contracts when cooled. As ambient temperatures gets colder, your tires inflation pressure is going down! and conversely As ambient temperatures get warmer, your tires inflation pressure is going up! The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower). You should check your tires inflation/pressure prior to each track day event. Another wards the morning you arrive at the track you should reset your tire pressure as called for (depending on weather and track conditions). You tires must be checked when the tires are cold, which usually is before they have run a mile
Answers & Comments
Verified answer
Even without a puncture or other defect, tires still lose pressure. There is no perfect seal. Tires can leak around the bead (junction between the tire and the rim), through the tire valve and even through the tire itself. But all of these would be very slow leaks. A friend of mine has a truck parking in the driveway. Been there for more than 5 years - still has air in the tires, but they are slowly going down.
Atmospheric changes can affect your tire pressure. Air contracts and expands with temperature. If the outside temperature drops, your tires could loose pressure. You could also have a slow leak which causes a tire to loose air over time. If you do have a leak, you can take it to a specialty tire chain which will fix it for around $25.
For more information you can check out my website which has an informative article on car maintenance.
Because of permeation, i.e. air seeping through the rubber. Tires loose more air in hot weather. CHECK your tires inflation/pressure - WHY? Since air is a gas, it expands when heated and contracts when cooled. As ambient temperatures gets colder, your tires inflation pressure is going down! and conversely As ambient temperatures get warmer, your tires inflation pressure is going up! The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower). You should check your tires inflation/pressure prior to each track day event. Another wards the morning you arrive at the track you should reset your tire pressure as called for (depending on weather and track conditions). You tires must be checked when the tires are cold, which usually is before they have run a mile
The whole car body pressure on tires so when car runs at any shock or due tu pressure, air leaks slowly and tire loose pressure.
Through punctures, bad seals, bad valve, porous rim, etc.
Even when it becomes colder outside the tire pressure goes down, making it appear to have leaked even though it has not.
They leak around the bead. They leak through holes. They leak through the valve stem. Ex girlfriends slash them.
Because they get worn out. Or there old. Or they got a nail. Or they got a slow leak.