I just pump 290 kpa on my wira 1.5 and i think it over. Is there anyway for me to lose the pressure? For 15" tyre, kpa should be 210 - 23is there anyway for me to lose the air pressure using petrol pump?

There is a pin like thing in the valve. U can use finger push it in and let the air out.

U know when is right when u hear pssssssssssssssst

Thanks for quick reply. Is it recommend to have 210 -230 kpa?

If u have to check your car. Different car different recommended pressure. 220 seems the standard

go to petrol pump and set 210 then poke the pump into your tire, it will release air for you.

OEM recommended psi is based on specific load like passenger and luggage weight and its distribution .
I exceed Avanza OEM recommended 31 psi front and 35 psi rear by selecting 40 psi for its fuel economy and agility (aka power) .
44 psi gave me too harsh a ride hence settling at 40 psi for relative comfort .

Note:These 40 and 44 psi readings are all permitted by tyre manufacturers .

This post has been edited by zeng: Oct 25 2020, 02:20 PM

Buy your own tyre pressure gauge and read/adjust the pressure when the tyres are cold. The pressure gauge at the petrol station might not be accurate.

IMHO, rather overinflate slightly than underinflate and running a risk of tyre blowout.

correct...based on total weight, including the car

over-inflation reduces rolling resistance hence better mileage, lighter steering feel...the detrimental effect is less traction more prone to bouncing and sliding...can be very very dangerous especially when wet


nope they did not say this...they say not to exceed 50 psi, and refer you to oem recommendations... reason is tire maker don't know what car/loading its being put into service, lighter car needs less pressure, heavy car needs more pressure... your 40/44 are fine since < 50 psi, but doesn't make it ideal for safety

This post has been edited by dwRK: Oct 28 2020, 09:46 AM

the ideal way is after changing new tires, follow recommended psi...after 5k or 10k, look at the tire wear, and adjust the psi accordingly...