PSA: Check the air pressure in your tires!

Eoin

Botch said:

While the pressure inside a tire does go down with the temperature, the air outside the tire also chills, and gets denser.  This denser air pushes in on the tire sidewalls more, popping out the central divot in the tires' contact patch with the road, resulting in a matching situation.  
 
Prove me wrong  (and I love retirement! )  
 

1. You are measuring the differential anyway.
2. The weight of air in the atmosphere won't change much due to a ground level temperature variance.

Eoin

Ozzie_Isaac said:

frazzdaddy said:

Legume said:

So...maintain pressure per door jamb or sidewall?  What’s the latitude above or below?

Motor vehicles suspension and traction systems mfg today are engineered with a specific tire design built into the control unit software. That's  why it's important to use the oem recommended tire.

OEMs have specific goals in mind.  If their goals of cheapest tire and most fuel mileage meet your needs, then by all means stick OEM.  I choose tires based on my specific needs.  OEMs have a lot to balance.  I do not need to make sacrifices due to fleet concerns.

I used to calibrate transmissions for an OEM.  I am very familiar with how they work. 

My M135i had Michelin Pilot Sport 2 fitted as OEM. Great tyre for driving balls out on a nice dry day during a sporty road test. But noisy, harsh ride, poor in the wet, bad below 40F, hopeless in the wet bellow 40F. Swapped out for Eagle F3 - better ride, quiet, predictable grip wet / dry / cold. The OEM had the wrong priorities for a road car. My tyre priority is wet grip, especially wet braking. The dry limits of a decent modern tyre are way above my balls level on a public road, emergency braking in poor weather is what is most likely to catch you out.

SGH

My damn tires was low this morning.