do dealers purposely under inflate tires to give cars a smoother ride?

[holden j caufield]

went car shopping with someone and almost every car seemed like the front tires are under inflated. Bought the car and sure enough the fronts were 5lbs less pressure.

 

[EvilYoda]

A lot of GTO owners on LS1GTO.com commented that their tires were OVERinflated...mine were upwards of 10psi too high!

Who knows, they're just bad with numbers

 

[mattocs]

That'd odd. I've never even thought of that. I keep my tires about 4 PSI over for the longer tire life and better gas mileage.

 

[IHateMyJob2004]

Originally posted by: OBW96
That'd odd. I've never even thought of that. I keep my tires about 4 PSI over for the longer tire life and better gas mileage.

Is that safe to do? I just want 1-2 psi over.

Actualyl, engineers always over estimate thigns for safety factors. 20% is a common overestimate. So, 4 psi over on a 30 psi tire isn't that bad.

Might be a good idea to check tire pressure after 1 hour of highway driving on a hot day.

 

[radioouman]

Yes.. I've had that happen on a car that we bought brand new.

 

[mercanucaribe]

Originally posted by: IHateMyJob2004

Originally posted by: OBW96
That'd odd. I've never even thought of that. I keep my tires about 4 PSI over for the longer tire life and better gas mileage.

Is that safe to do? I just want 1-2 psi over.

Actualyl, engineers always over estimate thigns for safety factors. 20% is a common overestimate. So, 4 psi over on a 30 psi tire isn't that bad.

Might be a good idea to check tire pressure after 1 hour of highway driving on a hot day.

Those numbers aren't for safety. The number on the sidewall is the safe psi limit. Running higher than standard pressure will only result in uneven tire wear. I still run mine about 3psi over.

 

[NutBucket]

The numbers are usually a compromise of handling, load capacity and noise. I found all my tires inflated to 30psi. Recommended is 35/32. I'm running them at 38/35. Handles a heck of a lot better then it did when I drove it off the lot but the tires suck anyway.

 

[IHateMyJob2004]

Originally posted by: mercanucaribe

Originally posted by: IHateMyJob2004

Originally posted by: OBW96
That'd odd. I've never even thought of that. I keep my tires about 4 PSI over for the longer tire life and better gas mileage.

Is that safe to do? I just want 1-2 psi over.

Actualyl, engineers always over estimate thigns for safety factors. 20% is a common overestimate. So, 4 psi over on a 30 psi tire isn't that bad.

Might be a good idea to check tire pressure after 1 hour of highway driving on a hot day.

Those numbers aren't for safety. The number on the sidewall is the safe psi limit. Running higher than standard pressure will only result in uneven tire wear. I still run mine about 3psi over.

Oh, so that will asue the tire to bulge, in the manner obvious to most.... More wear i nthe center then? Interesting.