Tire Pressure?

[tmf2004]

I thought there was a thread on tire pressure but i wasn't sure... when cold my tire pressure is at 29 but after driving and the rubber heating up its up arounf 31/32 on each tire... where should it be when cold? am i to low?

 

[StarPower]

On the 19" wheels it should be 33/35 psi front/rear when cold. You can find the pressures on a label inside the driver's side door.

 

[Mark_888]

I thought there was a thread on tire pressure but i wasn't sure... when cold my tire pressure is at 29 but after driving and the rubber heating up its up arounf 31/32 on each tire... where should it be when cold? am i to low?

I believe it should be 33 psi cold (which really means 70 F). The recommended PSI is in the owner's manual, and on the sticker in driver's door jamb.

For best results, I would inflate to 2 PSI over the recommendation, especially if driving a lot of hi-way miles. This also gives you some leeway as the tire loses pressure over time.

 

[dareckibmw]

I keep mine @36psi all around.

 

[kn5owa]

I believe it should be 33 psi cold (which really means 70 F). The recommended PSI is in the owner's manual, and on the sticker in driver's door jamb.

Pressures on this car are 33 F, 35 R as noted above by Starpower

I inflate 1 lb over to 34/36 since I check/inflate every two months. And with the usual, normal losses, it balances out.

 

[srobak]

I keep mine at 39 cold, 42 hot. Really helps with the MPG and the ride doesn't suffer at all (AWD on the Michelin replacements).

 

[Midnightsun]

Recommended pressure is always taken cold. Not a bad idea to increase by a lb or 2. Oddly enough, the Canadian 5.0 AWD is 35 psi all around whereas the US RWD is 33/35.

 

[Midnightsun]

I believe it should be 33 psi cold (which really means 70 F). The recommended PSI is in the owner's manual, and on the sticker in driver's door jamb.

For best results, I would inflate to 2 PSI over the recommendation, especially if driving a lot of hi-way miles. This also gives you some leeway as the tire loses pressure over time.

Cold is ambient outdoor temperature where you reside and may change depending on the time of year, not 70 degrees. Look at its this way. During the winter my car resides in my garage when not in use at lets say 70F. I inflate to 35lbs at this temperature. I now go to work however the ambient freezing temps cause my tire to drop 1 psi for every 10F so we are now talking around 5-6 psi under inflated. Same would occur if you drove from Florida to Canada for a winter vacation.

 

[tmf2004]

thanks guys.... been a long week... didn't think to check the door jam.. appreciate the answers..

 

[Jaeger]

I keep mine at 39 cold, 42 hot. Really helps with the MPG and the ride doesn't suffer at all (AWD on the Michelin replacements).

My V6 came came from the dealer at 40psi cold all around - 7psi overinflated relative to spec. First thing I noticed was that the ride seemed a bit more jiggly than I remembered from test drives. Dropped it down to 35 all around and the ride is noticeably smoother to me. It wasn't bad at all at the higher pressure - but small sharp impacts like expansion joints were definitely more noticeable to me.

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[Mark_888]

My V6 came came from the dealer at 40psi cold all around - 7psi overinflated relative to spec.

They are shipped that way from the overseas factory and dealer is supposed to lower them to spec as part of dealer prep. But it is not unusual for dealers to miss that.

 

[Jaeger]

They are shipped that way from the overseas factory and dealer is supposed to lower them to spec as part of dealer prep. But it is not unusual for dealers to miss that.

Interesting - did not know that - thanks.

 

[Nikgen]

I keep mine at 39 cold, 42 hot. Really helps with the MPG and the ride doesn't suffer at all (AWD on the Michelin replacements).

The ride definitely suffers a bit at 39 psi cold. You'll get more transmission of cracks, small bumps and expansion joints. It may not be an issue for you, but the ride is smoother at 33 psi all around as specified.

 

[Midnightsun]

39 cold will most likely cause premature wear in the center portion as the tire is riding more on this section now. Not to mention decreased adherence in wet conditions. This gives you idea what happens to wear with different pressures.

 

[Nikgen]

They are shipped that way from the overseas factory and dealer is supposed to lower them to spec as part of dealer prep. But it is not unusual for dealers to miss that.

Mark is spot on:

 

[Nikgen]

39 cold will most likely cause premature wear in the center portion as the tire is riding more on this section now. Not to mention decreased adherence in wet conditions. This gives you idea what happens to wear with different pressures.

Yup - follow Hyundai's advice for best all around performance:

 

[srobak]

The ride definitely suffers a bit at 39 psi cold. You'll get more transmission of cracks, small bumps and expansion joints. It may not be an issue for you, but the ride is smoother at 33 psi all around as specified.

I have tested at both and have not noticed any difference at all. *shrugs* YMMV

39 cold will most likely cause premature wear in the center portion as the tire is riding more on this section now. Not to mention decreased adherence in wet conditions. This gives you idea what happens to wear with different pressures.

Thankfully this isn't really an issue with the Michelins. My tire shop has done the measurements and it barely registered to the thousandth of an inch. Additionally - with the rear camber as out of whack from the factory as it is - by increasing the tire pressure you are actually increasing the contact patch size - not decreasing it. Combined with an aggressive rotation schedule (~8000 mi) and unidirectional tires that can and should be flipped on their rims every 4th rotation - it is absolutely no problem to run them a few lbs over.

 

[Uchiha madara]

make it on 33 for front and 35 for the rear


the reason is that the front tire heats is more than the rear tire so you will find that the tire pressure may reach to 38 or 39 on heat


and the rear tire doesn't have much heating so you need to make it on higher pressure to insure that the tire will not increase heat due to wide and huge friction area

 

[xsolara]

make it on 33 for front and 35 for the rear


the reason is that the front tire heats is more than the rear tire so you will find that the tire pressure may reach to 38 or 39 on heat


and the rear tire doesn't have much heating so you need to make it on higher pressure to insure that the tire will not increase heat due to wide and huge friction area

Might be true for a front wheel drive car but not for a rear drive ....stick with the mfg. recommends

 

[Nikgen]

I have tested at both and have not noticed any difference at all. *shrugs* YMMV .

Some folks are not as observant as others - but there is a definite difference in the road feel with an extra 6 psi over recommended inflation. The ride is also noticeably softer if you under inflate too - but like over inflation comes with downsides.

Thankfully this isn't really an issue with the Michelins. My tire shop has done the measurements and it barely registered to the thousandth of an inch. Additionally - with the rear camber as out of whack from the factory as it is - by increasing the tire pressure you are actually increasing the contact patch size - not decreasing it.

Why not just correct your out of whack rear camber? Over inflating won't change that... and will actually decrease the contact patch (all else equal).

Combined with an aggressive rotation schedule (~8000 mi) and unidirectional tires that can and should be flipped on their rims every 4th rotation - it is absolutely no problem to run them a few lbs over.

...6 psi is not a few lbs over - it's almost 20% over... it's your car and your money, so do what you want, but there are tradeoffs to running on overinflated tires that folks should be aware of.