Front and Back tyre pressure

[Shor]

Bros who have regularly check and pump their tires comment in here please. My experience for my 18" tire for my SUV. Recommended all 4 tires 33 psi. But I normally will pump 36 psi for the front and 33 psi for the rear.

 

 

This time, I tried all 4 tires 33 psi and I realized that the petrol consumption has went low meaning save quite a lot. What is your experience?

 

1. pressure for pumping your tire pressure for the best performance pressure?

 

2. pressure for the best long distance drive?

 

3. pressure for the quietest ride.

 

4. pressure for Petrol saving.

 

 

[Sky61]

for my car,

 

best FC = pump 250kpa front, 260kpa rears

best grip/traction/performance = pump 230kpa front, 240kpa rears

track = release air until 210kpa front, 220kpa rears

 

use to pump front more caz my logic was that the front takes the weight of the engine, but my tyre shop recommend rwd to pump slightly more at the rears, am quite comfortable with this form of settings.

[Shor]

Ya, tire shop oso advice me to pump more on the front. Thanks for your input.

 

for my car,

 

best FC = pump 250kpa front, 260kpa rears

best grip/traction/performance = pump 230kpa front, 240kpa rears

track = release air until 210kpa front, 220kpa rears

 

use to pump front more caz my logic was that the front takes the weight of the engine, but my tyre shop recommend rwd to pump slightly more at the rears, am quite comfortable with this form of settings.

 

[Coupecabriolet]

bro, different pressure settings works best for different types of cars. very hard to judge a one-size-fit.

 

e.g SUVs / sedan or saloon / small cars / sports cars etc

 

mostly different tyre size 16"~20"+, thickness or profile of tyres affects comfort level and fuel economy too, as with width of tyres too.

 

some cars have staggered tyres too.

 

for road noise or quietness, that one has got to do with brand or quality of tyres too

[Good-Carbuyer]

Normally different tire inflation pressures affect FC, and varies to the car model/usage. The thumb of rule for safety is to have both sides same tire inflation pressure to avoid loss of control/irratic control.

[Shor]

Both sides same pressure, meaning all 4 tires the same?

 

 

Normally different tire inflation pressures affect FC, and varies to the car model/usage. The thumb of rule for safety is to have both sides same tire inflation pressure to avoid loss of control/irratic control.

 

[Ben5266]

Bros who have regularly check and pump their tires comment in here please. My experience for my 18" tire for my SUV. Recommended all 4 tires 33 psi. But I normally will pump 36 psi for the front and 33 psi for the rear.

 

 

This time, I tried all 4 tires 33 psi and I realized that the petrol consumption has went low meaning save quite a lot. What is your experience?

 

1. pressure for pumping your tire pressure for the best performance pressure?

36

2. pressure for the best long distance drive?

36 - assuming it is heavy load

3. pressure for the quietest ride.

33 - actually not so much. most important is the rubber

4. pressure for Petrol saving.

36 - less contact, less friction

Most important, left and right must have same pressure.

Front back no need to be the same.

[Good-Carbuyer]

Both sides same pressure, meaning all 4 tires the same?

Can share your theory why the front need be same as the rear?

[Shor]

Oh, I post to seek recommendations. Theory front and back the same is the instructions on the car side. I did not follow though. I always pump front one more than the back one. And I also got no ideas what is the "correct" ways or "correct" practice.

 

 

 

Can share your theory why the front need be same as the rear?

 

[Asure7]

Think its safer to vary tyre pressure based on manufacturer's recommendation, using that as the base value.

 

If front +5%, rear +5% also, so that the ratio will be the same.

 

My logic is manufacturer would have taken into account the car's dynamics, weight-distribution etc, before making that recommendation. If the ratio not maintained, the balance may be disrupted.

[Shor]

So meaning sticking to the manufacturer's recommendation is the best bet?

 

 

Think its safer to vary tyre pressure based on manufacturer's recommendation, using that as the base value.

 

If front +5%, rear +5% also, so that the ratio will be the same.

 

My logic is manufacturer would have taken into account the car's dynamics, weight-distribution etc, before making that recommendation. If the ratio not maintained, the balance may be disrupted.

 

[Asure7]

Manufacturer recommendation is the balance between comfort and FC.

it's ok to vary the pressure a bit to your liking .

But what i meant was to maintain approximately same front:rear ratio.

 

For me, recommended was 230kpa for all 4.

I increase to 250 for all 4.

 

previous car recommended was 210 frt, 230 rear.

I used 210+10% frt, 230+10% rear. ==> approx. 230:250

 

But if you are an expert who wants to break out of the ratio to induce more understeer or oversteer, by all means :)

Edited June 1, 2011 by Asure7

[Good-Carbuyer]

Oh, I post to seek recommendations. Theory front and back the same is the instructions on the car side. I did not follow though. I always pump front one more than the back one. And I also got no ideas what is the "correct" ways or "correct" practice.

Most cars are front wheel drive. The front half of the car is heavier than the rear. So the front tire need to be inflated slightly higher pressure than the rear. Some car manufacturers indicate this on the driver's door or gloves compartment.

A fully laden car and a driver alone car needs different tire inflation pressure for longer trip, or higher driving speed.

Observant monitoring will soon set a guide for your own need.

Many/most manufacturers based on driver with one passenger requirement.

If the tire wear is even, it is likely to be the appropriate inflation pressure applicable fo your usage. Example: 220kpa recommended for my car. But I find that the tire wear showed under-inflation (our ambient air warmer than Japan, so I need to compensate for the difference).

[Timex1441]

Oh, I post to seek recommendations. Theory front and back the same is the instructions on the car side. I did not follow though. I always pump front one more than the back one. And I also got no ideas what is the "correct" ways or "correct" practice.

not all cars have "recommended" pressures as the same for 4 tyres....in fact my car's recommended pressure depends on the load --- up to 3 ppl, 1 set of pressures; >3 ppl, 1 set of pressures....and the front & back pressures r not the same (it's interesting tat the front & back pressures are reversed in higher/lower order for diff loads)

Edited June 1, 2011 by Timex1441

[Dallii]

But I find that the tire wear showed under-inflation (our ambient air warmer than Japan, so I need to compensate for the difference).

 

how to check if it's underinflation or overinflation or ok?

[Sforester]

My friend, take out the guessing game and follow the manufacturer tyre size and pressure specs in your car manual.

Well, if you going two sizes above, you going too far...

They will state the pressure specs for factory rims and usually one size above as well.

Front and rear pressure are different usually.. For mine, it differs by 20 - 30 kpa

 

 

[Babyt]

my old qashqai has 2 recommended pressures.

 

for 1-3 passenger , pump 230 for both

 

for 3-4 passengers w luggage, pump 230 front, 250 back.

[Good-Carbuyer]

how to check if it's underinflation or overinflation or ok?

Can observe the tire wear profile? Tire with more obvious worn part near the side walls means under-inflation. If more worn at the middle of the tire, over-inflation.