Standard tyre pressure? Front wheels 250 kPa, back 240 kPa?

Uncle Cabby SG

Can some experts here advise on how much pressure we must pump on our taxi tyres? For taxi models like Sonata n Kia Magentis, I heard it's 250 kPa (front wheels) n 240 kPa (back wheels). True?

If we follow the tyre pressure recommendations as stated on the tyres, the tyres always looks like under-pumped or not enough full leh..........

But if we over-pumped too much, can cause the taxi to skid easier cos the steering is lighter although can save more fuel.

And how often should we pump n check our tyres? Is once a week ok?

Loor SG

If u can get a hold of the car maunal for the model, then maybe you can find out the recommended pressure...and yes, make sure its within the tyre wall amounts too.

Otherwise, i would say anything around 220kPa - 260 kPa is generally okay for most passenger sedan vehicles. And yes, like u said lower or higher pressure has its own pros/cons.

Once a week to check pressures are good.

Uncle Cabby SG

ya........ tin u r right, 220 to 260 is quite standard..........

komade SG

follow the recommended pressures listed on the car manual or on a sign in the car,

do not over or under inflate the tyres at anytime

Poolman SG

220 is the best , road surface wet or dry .

although meter jump slower , but safer .

if 240 , bumpy and not suitable for wet road surfaces .

Although meter jump faster that's all .

220 recommendable , make less , drive safe .

220 when really hot weather , pressure goes up a bit to maybe 230 .

when cool weather , down to 210 maybe .

Loor SG

Good point....try not to check your tyre temperature after you have travelled a long way i.e. when your tires are 'hot'. The pressure will be slightly increased at this time, so the best way to get an accurate reading is maybe first thing when you move off for your shift or something.

Tyre pressure will affect the meter as well? I never thought about that.

Poolman SG

Tyre pressure will affect the meter as well? I never thought about that.

Yes .... makes a diff .

bowah SG

Korean and continental cars tends to be more heavy then jap cars, so for jap, 2.0 cc 220kpa should be ok, for others 230 to 235kpa will be just fine. Over inflate will end up tyre out of shape, the air will surge toward the weaking point of the tyre and make the tyre oval instead of round, that makes your car bumpy and in long run, the absorbers get worn easily. Under inflate, tyre worn out faster and more fuel is needed to drive.

Loor SG

Front usually slightly higher kPa than back, i'm guessing because of engine weight - unless you drive a ferrari, porsche etc.

Also slightly different kPa for different loads e.g. maybe 240kPa for 1-2 passengers, 250 for 3-5 passengers. For taxi - maybe a higher pressure would be the best option?

komade SG

when hot dun pump pressure is not accurate like Lor

say best bfore start of shift or after u wash car then later go pump

Uncle Cabby SG

big bro Poolman,

u sure u only pump 220? cos only when i pump 250 kPa, then my tyres looks full.

220 i tin is too little for yr Wish tyres ?

220 i tin is more suitable for small cc cars, ie 1600cc n below

most Spore taxis r 2000cc n above................

bowah SG

220kpa is good for new typre, as time goes by, the rubber also get hardened, you need more pressure to inflate it, notice new tyres rubber are more flexible, when you park, you see the tyre deflate abit on the floor, that is good tyre, after usuage, tyre rubber become worn and hardened, not so flexible, if you do not have higher pressure like 235kpa and above, it will worn faster, and some may hv crack lines

Poolman SG

250 in my experience , it's a very dangerous pressure for taxis , esp Crown .

I have tried 240 on my Wish , very bumpy .

So i lower 230 during wet days .

220 on days like this few days .

Poolman SG

Most tyres , every weeks must go pump pressure , why ?

If u pump in 220 last Sunday like i did .

Then next sunday , will be 210 like that , cos pressure goes down due to air leakage from the tyre nossil .

Poolman SG

250 kpa ?

Good luck to those people .

it might looked really good , driving also good , bang also lagi good .

Crown put 230kpa , expressway braking distance can be as far as 2 vehicles length to full stop .

250kpa ? Must keep away at least 5 cars distance to full stop .

Raining day ...... Crown never stop until it hit the front vehicle .

komade SG

follow the pressure stated by manufactures is the best Wink

Loor SG

crown no ABS?

Poolman SG

Crown body weigh too light .

Body too big .... tyres used really not for this size of vehicle .

Add salt to wounds , the 3000cc capacity engine was so forceful , that even if u brake hard , the force still will push the vehicle forward .

With engine brake , still not too bad .

Some cabbies still use free gear to make a full stop , which make it even more dangerous .

Not only free gear push the vehicle more forward with higher speed , the lousy tyre did not help at all .

Ski is very common for this vehicle .

Sgm40 vps SG

220kPa is minimum. not ask you to pump 220kPa.

260/250kPa or 250/240kPa for front & rear respectively is my choice. taken into consideration that we often fetch 5 full adults + luggage.

CDG mechanic pump 320kPa for my both front brand new tyres!

Fwahhh SG

One way is to let out the some hot air first after driving to get an accurate tyre pressure when u pump, just make sure the pump is working in the first place.