Another tire wear/pressure thread

zigzag · #1 10-04-2009, 10:14 PM

Did you check an alignment on dealers machine?
Strange thing I found when i was using Michelin Latitude.... when you start driving and tire is temperature is ambient ( around 32 psi), so after 20-30 minutes of driving , espessially in summer time( like 75-85- degrees), tire pressure rises to 35-37 psi on Michelins and in that case you are driving on overinflated tire... usual temperature gap should be 2-3 max. of cause it depends on tire...
It does not happening to my Vredestien's... gap on VR's is 2 psi, regardless of outside temperature

zigzag · #2 10-04-2009, 10:16 PM

Just measure tire pressure before driving and than measure tire pressure after 30- min diving, post a difference....

zigzag · #3 10-04-2009, 10:24 PM

But remember, that lowering tire pressure will affect you car steering and rolling resistance.... I would stick with 32-33 psi ambient temperature and would not worry about exessive center wear. Its cheaper to change tires instead of car

JCL · #4 10-04-2009, 10:44 PM

Quote:

Originally Posted by zigzag

When you start driving and tire is temperature is ambient ( around 32 psi), so after 20-30 minutes of driving , espessially in summer time( like 75-85- degrees), tire pressure rises to 35-37 psi on Michelins and in that case you are driving on overinflated tire...

No, you are not driving on an overinflated tire if you are measuring the hot inflation pressure. The 32 psi spec is the cold pressure, there is no spec for hot pressure. Deflating a hot tire to the cold inflation pressure will leave it dangerously under-inflated when it is cold.

zigzag · #5 10-04-2009, 10:58 PM

JCL,

I'm talking about pressure gap between hot and ambient temperatures.... It seems that different tire have different gaps, like Michelin has 3-4 gap, VR's 2-3...
Now i'm interested in Bridgestone, how big is the gap?

JCL · #6 10-04-2009, 11:11 PM

Quote:

Originally Posted by zigzag

JCL,

I'm talking about pressure gap between hot and ambient temperatures.... It seems that different tire have different gaps, like Michelin has 3-4 gap, VR's 2-3...
Now i'm interested in Bridgestone, how big is the gap?

I know what you are saying, but measuring a hot tire and concluding that it is now overinflated is just plain wrong. You don't know the spec for hot inflation, just cold inflation. Every tire will increase in pressure when driven.

The reason that manufacturers don't publish hot inflation pressures is that they are so variable. How high is the ambient temperature? How hard are you driving it? How far have you driven it?

And that is what you are seeing with your measurement of different tires. There is so much variation from the ambient, driving style, distance, etc, that the make of tire is just not relevant.

zigzag · #7 10-04-2009, 11:56 PM

Yep.

And also if, Michelins pressure Gap is 3-4, so driving temperature of tire will be 35-36 psi what is much more from ambient, i would assume that there could exessive center line wear on that temperature difference.... However I dont experience it on my Diamaris. Scratching head...

Who knows, I might be wrong, just wanted to help. However some people reported that their sweet tire pressure spot is 33..35 psi, but they did not report any exessive tire wear.