Tyre pressure

[dr. d]

Hi folks,

I have a question regarding tire pressure gauge accuracy.

I'm contemplating to buy a tire pressure gauge and I saw one in Blade Auto Center, its brand is OMP with accuracy of +/-1.
What does +/-1 accuracy mean? Is that accuracy good?

Many Thanks.

it means that the real value is somewhere within -1 to +1 unit (psi?) of the reading displayed on the gauge.
that is, assuming the gadget is truly accurate, out of the box.
but that's another question, altogether..

[Suzumiya]

it means that the real value is somewhere within -1 to +1 unit (psi?) of the reading displayed on the gauge.
that is, assuming the gadget is truly accurate, out of the box.
but that's another question, altogether..

Alright. Thanks.

[kisshmet]

or may bengkong na yung lip ng mags mo like what happened to my mags nung binuhusan ng water with soap yung pito hindi bumula pero nung binuhusan yung lip dun na bumula ng husto dun pala sumisingaw although napaka konti ng singaw the tire loses about 1-2 psi every 4 days, kaya ang ginagawa ko every friday top up ng hangin and then on monday before going to work top up ulet.

This could also be caused by running a flat tire

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[Darc]

Ano po correct/recommended tyre pressure ng vehicle ko?

Vechicle: Toyota Fortuner 2015 (2" lifted)
Tyres: Monsta AT 265/70R17
Wheels: Fuel Vapor 17"

Newly changed po yung wheels ang tyres ko 1 week ago. Hindi na ako sure if kailangan ko pa sundin yung nasa door panel ko (30 PSI) - ganito rin sabi ng shop kung saan ko binili yung wheels/tyres, 30 to 32psi lang daw.

Pagka-30 kasi feeling ko masyadong yupi yung gulong.

[Lakwatsero]

Ano po correct/recommended tyre pressure ng vehicle ko?

Vechicle: Toyota Fortuner 2015 (2" lifted)
Tyres: Monsta AT 265/70R17
Wheels: Fuel Vapor 17"

Newly changed po yung wheels ang tyres ko 1 week ago. Hindi na ako sure if kailangan ko pa sundin yung nasa door panel ko (30 PSI) - ganito rin sabi ng shop kung saan ko binili yung wheels/tyres, 30 to 32psi lang daw.

Pagka-30 kasi feeling ko masyadong yupi yung gulong.

Driver's door sticker is still accurate if similar aspect ratio. Mostly 30 to 32 is safe. Adjust depending on load or terrain na lang.

If you get lower profile tires, that's when you need to increase pressure para mag stiffen sidewall.

[dr. d]

Ano po correct/recommended tyre pressure ng vehicle ko?

Vechicle: Toyota Fortuner 2015 (2" lifted)
Tyres: Monsta AT 265/70R17
Wheels: Fuel Vapor 17"

Newly changed po yung wheels ang tyres ko 1 week ago. Hindi na ako sure if kailangan ko pa sundin yung nasa door panel ko (30 PSI) - ganito rin sabi ng shop kung saan ko binili yung wheels/tyres, 30 to 32psi lang daw.

Pagka-30 kasi feeling ko masyadong yupi yung gulong.

i read somewhere, that we can overinflate it by 10% over the recommended psi, as long as we do not go over the tire's maximum psi.
i have been doing it for many years now, and the tires do not seem to complain by showing abnormal tire wear pattern.
n.b. my tires are factory spec.

[kagalingan]

ako 40 sa likod, 35 sa harap. Ako lang nag-analyze ganito setup. Naisip ko kasi yung gulong ng formula 1 racing malaki sa likod kaya ganun ginawa ko sa hangin.

tapos pakita ko sa vulcanizing if maganda kain ng gulong.

[Walter]

i read somewhere, that we can overinflate it by 10% over the recommended psi, as long as we do not go over the tire's maximum psi.
i have been doing it for many years now, and the tires do not seem to complain by showing abnormal tire wear pattern.
n.b. my tires are factory spec.

It's the suspension that will complain ... usually the stabilizer link goes first ...

[dr. d]

It's the suspension that will complain ... usually the stabilizer link goes first ...

depende siguro sa kotse, sa nagmamaneho, at saan minamaneho.
my innova has over 140K km on the odometer, and except for the shocks, the suspension is still the one that came with the car, from the factory.
it's a bit noisy now, but still serviceable.

[Athrunzala]

It's the suspension that will complain ... usually the stabilizer link goes first ...

Totoo ba ito? Or baka sa wear and tear lang naman as time goes on kaya nasisira stablizer link.
Kahit naman siguro underinflated nasisira din stablizer link...

[Athrunzala]

i read somewhere, that we can overinflate it by 10% over the recommended psi, as long as we do not go over the tire's maximum psi.
i have been doing it for many years now, and the tires do not seem to complain by showing abnormal tire wear pattern.
n.b. my tires are factory spec.

Nabasa ko lang sa internet na during hot summer, halos nag-aadd ng +2 psi sa gulong mo ang hot temperature lalo na kapag nasa expressway ka. Kapag nagpapahinga na ang sasakyan mo e mawawala na yung +2 psi sa gulong. Do you think this is true?

[_Qwerty_]

As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

Nabasa ko lang sa internet na during hot summer, halos nag-aadd ng +2 psi sa gulong mo ang hot temperature lalo na kapag nasa expressway ka. Kapag nagpapahinga na ang sasakyan mo e mawawala na yung +2 psi sa gulong. Do you think this is true?

[Athrunzala]

Thank for the explanation bro!

[dr. d]

Nabasa ko lang sa internet na during hot summer, halos nag-aadd ng +2 psi sa gulong mo ang hot temperature lalo na kapag nasa expressway ka. Kapag nagpapahinga na ang sasakyan mo e mawawala na yung +2 psi sa gulong. Do you think this is true?

sounds logical.
but i do not go thru the ritual.
i just put in, the door pillar spec + 5 to 10%.
over the many years, i have not noticed any negative effects thereof.

[Athrunzala]

sounds logical.
but i do not go thru the ritual.
i just put in, the door pillar spec + 5 to 10%.
over the many years, i have not noticed any negative effects thereof.

I'm also leaning in this view, the maximum psi is already written on the tire codes at the side of the tire. I also have not seen any of our tires having a wornout tire-thread at the middle part of the tire which is an indicator of overinflation.

[Lew_Alcindor]

Nabasa ko lang sa internet na during hot summer, halos nag-aadd ng +2 psi sa gulong mo ang hot temperature lalo na kapag nasa expressway ka. Kapag nagpapahinga na ang sasakyan mo e mawawala na yung +2 psi sa gulong. Do you think this is true?

Mukang may umabsent sa HS chem class? That is basic gas law. Guy Lussac Law. Pressure increases as temperature increase assuming same volume (tires can expand but only up to a certain point).

If you have TPMS, you would havfe observed that already. With ordinary air, I observe as much as 5psi increase from my garage to SLEX running at speed limit. With nitrogen, the increase is only around 2psi.

[ninjababez]

Totoo ba ito? Or baka sa wear and tear lang naman as time goes on kaya nasisira stablizer link.
Kahit naman siguro underinflated nasisira din stablizer link...

pagover inflated ang tires suspension masira. pag under naman, mas malaki possibility yun sidewall ng tires.
btw ginagawa ko pag nag inflate ng gulong, as much as possible gabi or maagang maaga; or pag mainit talaga panahon, gas out ko muna tires ko for 30 seconds, bago ko karagahan ng hangin. so far effective itong style ko and napansin ko mas consistent ang psi ng 4 tires.

[tarzegetakizerd]

As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

Also, wheels are hot during use due to friction + road surface temperature. Pag napahinga na, bababa talaga pressure.

[dr. d]

Mukang may umabsent sa HS chem class? That is basic gas law. Guy Lussac Law. Pressure increases as temperature increase assuming same volume (tires can expand but only up to a certain point).

If you have TPMS, you would havfe observed that already. With ordinary air, I observe as much as 5psi increase from my garage to SLEX running at speed limit. With nitrogen, the increase is only around 2psi.

it takes extra effort to keep looking awake during the 1 pm chemistry lecture.

car manufacturers and tire manufacturers already put into the equation, the expected air expansion when the tire heats up with use, and air contraction during the cool-down period. we but have to follow the prescribed psi.

[oj88]

^ I agree on this.

The recommended pressure on the door jamb already takes into consideration that the mass of car owners will just be using regular air to pressurize their tires. That also means that air expansion has also been factored in. If this is not the case, you would be seeing an alarming cases of tires exploding on the road.

Contrary to popular belief, tires are less likely to explode when slightly over-inflated. A tire's structural integrity relies on the air pressure inside it. Under-inflated tires will cause excessive flexing and stress that will eventually lead to overheating. In which case, this will cause the tire to disintegrate while in operation... sometimes catastrophically.