Speaking of tires?

[Bradley Walker]

When inflating tires to the recommended tire pressure 29/30, are these
numbers for cold tire pressure before the car is being driven, or after the
car has been driven?

 

[Uncle Ben]

When inflating tires to the recommended tire pressure 29/30, are these
numbers for cold tire pressure before the car is being driven, or after the
car has been driven?

Cold.

 

[Carl 1 Lucky Texan]

When inflating tires to the recommended tire pressure 29/30, are these
numbers for cold tire pressure before the car is being driven, or after the
car has been driven?

Don't be afraid to increase that number by 5-10 percent(maintaining a
fron/rear difference). Often, a tire will be low by the time you recheck
them, any extra load (vacation - carpooling, etc.) will heat them up
more so xtra pressure is needed, and, most cars just handle better. I
THINK some car manufacturers err on the low side because the car rides
more softly.

do not exceed the number on the sidewall.

Carl

 

[Bradley Walker]

Thanks. I had been messing with the figures somewhat, inflating upto a
34/35 down to a 29/30, etc. My goal was to see if it affected my gas
mileage or softened the ride any. I was curious how much leeway I was
allowed and also because after my 90k servicing at the dealership, I noticed
that the tires were deflated to 24/25 so that made me wonder if the 29/30
was a hot temp.

 

[hippo]

When inflating tires to the recommended tire pressure 29/30, are these
numbers for cold tire pressure before the car is being driven, or after

the car has been driven?

Cold, or at least within first 5Km/3Ml is good.
I'm running 32F/35R on an OBW & it works well. Cheers

 

[bigjim]

Why bother with front rear differences in psi? I run 32psi all around
and found it gives good handling ride and mileage,

 

[Carl 1 Lucky Texan]

Why bother with front rear differences in psi? I run 32psi all around
and found it gives good handling ride and mileage,

It may be a little more critical on AWD cars to help reduce the chance
of torque bind. The car does not, after all, have 50/50 weight distribution.

I doubt it would be a big issue though. Some of the guys at the autoX I
was in this weekend run the same on all 4 corners. But then they
re-adjust for the drive home.

Carl

 

[JD]

Why bother with front rear differences in psi? I run 32psi all around
and found it gives good handling ride and mileage,

Depends on the kind of driving you are doing and the temperature. I run the
same pressures all around on the highway, but if I am driving on the
twisties, I put 6PSI more in front than in the rear. It helps reduce
understeer.

 

[Rick Courtright]

When inflating tires to the recommended tire pressure 29/30, are these
numbers for cold tire pressure before the car is being driven, or after the
car has been driven?

Hi,

As everyone's already told you, these are "cold" pressures. I think
you'll generally see "cold" defined as having sat for at least 3 hrs or
driven less than a mile or so (these numbers will vary according to
source.)

For myself, I consider the door sticker to be MINIMUM pressures. Many
people find they get better mileage (both fuel and tire) and/or handling
with higher pressures. Experiment for yourself, going a pound or two at
a time, to see what works best for you and your driving style. As
another poster mentioned, highway conditions aren't the same as
mountains, etc. A trusted tire guy once told me to always go about 2 psi
over the door sticker (as long as it doesn't exceed the tire sidewall
rating) to account for the widely varied temps we have on a daily basis
here in SoCal. YMMV on that issue.

And get a GOOD gauge! Some folks like digitals. I have one, but prefer
the Accu-Gage to all others I've used. Some of the better shops sell
them, or you can go online to www.getagauge.com. When adding air, I've
seen it recommended for decades to always go a bit high, then bleed down
to the desired pressure. The Accu-Gage and some others have a built-in
bleeding capacity that makes them really easy to use for that purpose.

Rick