2 psi more than OEM recommended pressure is ok, as it's way below tyre manufacturer's maximum permissible pressure.
2 psi below would not be ok at designed loads, as it promotes tyre overheating and potential tyre burst at prolonged high speed.
I typically fill air up to 30 % higher than OEM recommendation for agility and better fuel economy with acceptable increased ride harshness.

This post has been edited by zeng: Feb 2 2017, 09:50 AM

That's right, up to 30% overpressure.
Wira 1.5 recommends 29 psi all round . Mine is 37 psi.
Had been monitoring for several years, no premature wear (uneven botak) at the tyre centreline area.

This post has been edited by zeng: Feb 2 2017, 04:28 PM

Nooo ......

This ..


This post has been edited by zeng: Feb 4 2017, 10:18 PM

Nice info from Camry!
I learned from internet saying for highway travelling (km/hr not specified), increase OEM pressure by 10%.
So I started off upping 10%, now in 30% territory ....
Would appreciate very much if you could upload a picture of said sticker... for general guidance ..... if it isn't too cumbersome for you.

Thanks heaps, mate.
Learning something new and authoritative on tyre pressures from your posts .....
I read some tyre literature saying that after parking between 30 min to an hour, one may pump air at indicated OEM cold tyre pressure.
Your attachments are rather detail and specific...
Btw, can I have your prior permission to upload your above pictures in forums like Bitog/lowyat etc for the benefits of others in times to come ?

This post has been edited by zeng: Feb 11 2017, 11:35 PM

Unfortunately I beg to differ on this.

This post has been edited by zeng: Jul 2 2017, 01:20 PM

I believe these two tyre sizes 'happen' to have the same load index, therefore same OEM recommended tyre pressures for both front and rear would be applicable.
However in my 1.3 Avanza, I select over-pressure of 275 kpa in all 4 tyres for agility and fuel economy.

This post has been edited by zeng: Jul 13 2017, 10:19 PM

Yes, it's on the high side for Avanza's weight and it's recommended 210 front 240 kpa rear.
But, it's way below the tyre's maximum allowable weight/air-pressure of 310 kpa.
No uneven tyre wear though.

Without knowing further details from your car and tyre size, all four tyres on 40 psi should be ok for agility and FE.
All four tyres on 33 psi should be fine too.

My wira calls for 29 psi on all four, but I pump up to 37/38 psi for agility.

240 kpa is ok for your car, that specifies 210 kpa for front and 220 kpa for rear.
These tyres could go up to 250 kpa if you wish, up to 160 km/hr.

My wira 1.5 (and Avanza 1.3) tyres are rated at maximum pressure of 51 psi too.
Proton specifies 29 psi for front and rear in Good Year 75/70R13.(Refer to driver side door pillar).
I had been applying 37-38 psi tyre pressure for umpteen years with good results.

Yes, one should not pump air to the maximum pressure indicated, as like 51 psi for some tyres.

I pump all my 82H/88H tyres up to 280 kpa/ 41 psi for fuel economy and agility.

My rule of thumb is about 4 psi.

My Avanza specifies 31 front and 35 rear.
I pumped 38 psi, and now 41 psi on all four tyres ...........................
for its maximum tyre loading and maximum tyre road speed which isn't required for the Avanza, but fine for the tyres anyway.

This post has been edited by zeng: Feb 21 2018, 10:52 AM

More for agility ... and then for fuel economy, yet stay within specs of tyres in question.
Also note tyre pressure drops by about 3 psi in every 1-1.5 month of use .

... not really with good road surface in KL/Subang Jaya areas, other than safety bumps within Taman where I typically move at 15-25 km/hr.

Longer, yes.
Significant, no .

185/70R14 88H tyres.