Does inflating a bike tire affect temperature?

Question

Temperature of bike tire influenced by inflation, or does it remain constant?

Answer 1

It increases the temperature briefly. Then entropy takes over and it assumes the ambient air temperature.

Answer 2

If you're really asking whether the air affects tire compound temperature, then we should examine two different cases.

Case 1: Inflating the tire (wheel is stationary). In this case, there is a small (but measurable) increase in compound temperature as the friction of the moving air heats up the compound inner surface. However, this is so small that you can neglect it for most conditions you'd actually be riding in.

Case 2: Tire is already inflated (but wheel is moving). In this case, it's no the addition of air that determines tire temeprature, but the amount already inside creating a contact point on the road surface. As the tire "rubs" against the ground, it will warm up - if the contact patch is small, the tire's average temperature will go down (even though the contact point temerpature will be slightly higher). This is why professional cyclists tend to run tire pressures of 150psi or more ... to reduce rolling friction. Conversely, if the tire is under-pressured, there is more in contact and friction (and the consequent generation of heat) is increased.

In both cases, there will eventually be a thermal equilibrium point.

Answer 3

No, it's the other way around. The exterior temperature can affect the inflation reading because air expands when heated. So if you inflate your tires on a cool day, don't put too much air. If the outside temperature warms up enough, the air inside the tires will expand and possible damage the tires. Conversely, if you inflate the tires when it's hot, you might notice that the tires seem flatter once the temperature cools.

Answer 4

Heat is a direct result of gas being placed under pressure. Yes, inflating a tire can change the temperature of a tire.

Answer 5

the first rule to know is that most of thing shrink in cold and expand in hot and air is one of those thing
so if the temperature is let say 20 Celsius and the pressure of your tire is the same and have 30 psi and you take you bike for a ride and check the temperature of the tire ( let say 50 Celsius ) the gauge might marque 35 psi
or if the temperature is let say 20 Celsius and the pressure of your tire is the same and have 30 psi and the next day its -20 Celsius then it might have 20 psi

Answer 6

Yes, it's the opposite.Air temperature effects tire pressure, but it really has discernible effect on a bicycle tire in most weather humans can survive in. We'd be getting into the theoretical, not the practical as far as cycling goes.

Answer 7

Unless the temperature difference is substantial. I mean from below freezing to desert like conditions the difference will not be discernible. It's not something you need to worry about.
You should be checking your tyre pressure EVERY time you start a ride anyway. So it should always be right at your required pressure.
Interesting question though. Cheers.

Answer 8

yes it does...
PV = nRT

we increase the pressure amd inflate the tyre. Here voume increases and there is a net increase in LHS therefore RHS increases proportionately. since T is the only variable , it too increases.

I am guessing but in a tyre since volume is approx proportional to the pressure atleast in the intial part of the graph, i guess the temp increase is approx the square of the increase in pressure...

But in the end due to exchange of heat...evrything settles down

Answer 9

Anytime you change pressure in a gas (I.E. air) it affects temperature. Some people use nitrogen instead of compressed air because it is more stable.

Answer 10

anything that gets compressed heats. diesel engines use this knowledge to run. put your finger over the pump and depress thats compressed air. gimme the points