Lestat13

hi, sorry but i can't seem to find the recommended tyre pressure on the tyre sidewall... can someone tell me? i'm asking for stock 6MT 18 inch rims with the factory fitted bridgestone potenzas...

mkztg

My owners manual says:

for both Front/Rear

220 kPa (2.2 kgf/cm2, 32psi or lb/po2)

Whatever system of measurement you use, there it is. I hope that helps.

Lestat13

thanks, man... lol, looks like i got it wrong... inflated till 35psi/240kPa...

INXS

I think 34 / 235psi is gd

Lestat13

thanks for all the info... anyway i feel that the tyre pump at petrol kiosks aren't that accurate?

coupe07

check out the sticker on the side doors. The recomended psi is there.

Emperor

Go for the SPC ones with digital gauges. And kiasu me always pump not long after starting the car with no passengers in it; to get a accurate tyre pressure.

Anyway since i got nitrogen in my tyres now i need not do that anymore.

INXS

Emperor, whats gd about N?

sqflyer

Not true leh... filling with N doesn't mean it won't lose pressure.

legendary

recommended tyre pressure is 220k. However, I usually pump more as I like to drive with lighter steering.

On my old car, I used to pump up to 280 !!

Was wondering whether it is dangerous or not?? Anyone can tell me? I used to get my tyres fitted at Stamford Tyres and the boss there said the "low profile" tyres I had could take up to 320k !!

Is tis true?

azzaboynt

I did some driver instruction course that Mazda Australia threw in when purchasing an RX8.

The instructors recommended a minimum of 37psi. Their reasoning is that the car manufacturers get complaints about "bumpy" suspension and therefore recommend lower tyre pressure for comfort.

Personally I keep my tyres (stock 18's) at 40psi.

lennon

I pump 35 PSI when i replace stock tyres with AD07.... 32 PSI is too soft......

Emperor

Half right. Road tested. My tyres now lose very very little air, my monthly checks confirm this as compared to the uneven loss of tyre pressure using atmospheric air.

Why not use helium or hydrogen? Hydrogen is explosive on contact with oxygen. And both helium and hydrogen molecules are so small that the tyres lose pressure very fast.

Anyway most tyre shops now give free nitrogen top ups when you purchase tyres or rims. When nitrogen first reach SG, it costs at least $15 to top up.

Got this from a website as i lazy to type:

Why Nitrogen?
Oxygen is our tyre’s worst enemy. Air is about 78% nitrogen, 21% oxygen, and 1% other gases. Nitrogen is inert, non-combustible, and non corrosive. While oxygen on the other hand while beneficial to our engine is a destructive element for our "rubbers". When tyres are exposed to air, a gradual deterioration begins - the oxidation of the rubber in the tyre. Notice what happens to a rubber band over time? It loses its elasticity and strength. This same process occurs in tyres inflated with standard compressed air as the oxygen attacks the rubber, working from the inside out until the oxygen permeates the tyre structure and ultimately the tread.

Is All Nitrogen Gas Equal?
No, nitrogen from nitrogen generators are available in different purities, generally ranging from 95% (low purity) to 99.9% (high purity).

What Purity Should I Use
Favorable aging and longevity tests result were with 98% or better; which is strongly recommend for inflating your tyres.

What Are the Other Benefits of Nitrogen Inflation?

* Longer tyre life
Road tests show that tyres inflated with nitrogen lasted 25-30% longer and road failures were reduced by 50%.

* Tyres hold their pressure longer
Nitrogen diffuses thru the walls of the tyre 25-30% slower rate than air, significantly reducing tire pressure loss between inflation checks. Under inflated tires wear faster. A tire that is 10% under inflated will lose approximately 7% of its service life.

* Fewer tyre failures
Tyres strength are affected by oxidation, heat and pressure. The oxidation process weakened the tyre, and heat from rolling accelerated the process. This oxidation is referred to as "fatigue" and "aging". Nitrogen filled tyres was found to have twice the life in both field and laboratory tests.

* Better fuel mileage and handling
Tyres that are properly inflated roll better than under inflated tyres and giving better fuel mileage. Tyres that are properly inflated also respond better to steering input and handle better.

* Rims and wheels resist rust better
Standard compressed air contain moisture while nitrogen produced by most systems is completely dry and without moisture rims and wheels are less likely to rust.

sqflyer

Hmm... did I ask why use Nitrogen? I know the benefits and don't disagree with using it either... just individual preference. Instead, why don't you list the disadvantages of using Nitrogen?

Mugo

Temperature stability of nitrogen reduces pressure build-up due to temperatures, keeping the tyres in peak performing pressure ranges throughout the runs.

Mugo

It's really troublesome to go down to your favourite tyre shop to get a refill every now and then. As a result, you're even less likely to keep your tyres properly inflated due to the inconvenience, negating most of the advantages the nitrogen has provided.

And oh ya, you won't feel any difference, not even if you go tracking.

Emperor

Then again because of the very slow loss of pressure; i need not visit the tyre shop often.

And the main reason why i used nitrogen is because it was free. Secondly i was concerned about the water content in the wheels due to our high humidity.

cuscorex

ohhh nooo.....lai liao.....

coupe07

hahahahahahahahaahahaha

sandman369

for those with sensitive backside like me, get a proper tire pressure gauge with pressure release gauge (eg snap-on, etc).

the recommended 32psi generally refers to cold inflation temp. fill more at pertrol station and can check when tires are cold. from my exp, tire should increase about 2psi for normal night driving and 4psi during hot day.

also, for handling, adopt higher pressure for rear to reduce oversteer and vice versa.

nitrogen? too much trouble tho must agree that there are advantages using it.

Genesis

Nitrogen is linked to fertilizer right?...so using it with your tires will make them ****

Emperor

Its ammonium nitrate. Different from pure Nitrogen gas.

H2SO4 will remove fungus on your feet since it has sulfur.

Genesis

Thx for clarifying bro....sounds like I need the H2SO4 to eradicate a nasty athletes foot problem I've had for years (itch itch)

Emperor

Bro. I just joking only. If you really use H2SO4, you will not have a foot problem.

Sulphuric acid.

Fab 8

Talk about a thread hijack... from tyre pressure to Genesis' fungus infected foot!

Back on topic, my tyres are inflated at 36psi cold. Steering feels sharper, but slightly harsher ride.