Tyre (Tire) Pressure

[Bredbury Blue]

The inside plaque on my car refers to 33psi front/30psi rear.

 

1. That's the recommended (cold) minimum pressure - correct?

 

2. I've noticed when picking up cars after they've been for maintenance that mechanics put a lot more air pressure in than stated on the plaque. This car had 40-41psi all around (not 33psi front/30psi rear).

 

I read online its best to put 20-25% above recommended psi which would give something like 40psi. Is that correct/advisable?

 

3. Should i have 40-41psi all around or less in the rear (based on the recommendation)?

 

Thoughts.

[transam]

You put in what the door shut sticker PSI states cold for your ride if it has the original tyre size fitted... Don't listen to BS...

[HAKAPALITA]

Use the Dealership for Service.Tires set correctly.

[richard_smith237]

8 minutes ago, transam said:

You put in what the door shut sticker PSI states cold for your ride if it has the original tyre size fitted... Don't listen to BS...

 

Like a coiled spring, ready to jump into action on any 'tyre-pressure' related thread....  

[cornishcarlos]

I stick to 32 psi all round. I definitely check them if they have been anywhere near a service centre ????????

[richard_smith237]

4 minutes ago, HAKAPALITA said:

Use the Dealership for Service.Tires set correctly.

 

You trust the laborers at dealership to be bothered about small details like tyre pressure?

 

Personally, I just put in what it suggests in the manual... (regardless of time of day)... the tyre pressures get checked every couple of months or so or before a long journey - the drift is only 2-3 psi... 

 

I'm a bit more careful with the motorcycles and check the tire pressures more regularly.

 

[VocalNeal]

Just what is says on the plaque.

[Lungstib]

Many of the mechanics I have used have no pressure gauge. A mechanic in India when questioned why he put 20psi more in my tyres than I had asked for said " I like you, I gave you some more, free". I'd stick to the makers recommendation.

[johng]

I put 36 psi in my car and motorcycles and 60 in my bicycles.
If ever a "mechanic" inflated them always 100+ psi !

[Lacessit]

It depends on what you want. Higher pressures will give better fuel economy, but a rougher ride. I just even everything up, 32 psi all round.

The proof of the pudding is there. I bought new Michelins for my Vios. 60,000 km later, they are still a long way from the tread wear indicators. Mind you, I don't do burnouts either.

[Pilotman]

I've only just managed to master the air pumps at most Thai filling stations.  They don't seem to be too efficient at giving you the pressure you ask for?   

[wgdanson]

54 minutes ago, HAKAPALITA said:

Use the Dealership for Service.Tires set correctly.

No, do not. I take my Vigo to Toyota for service every 10k, and if I do not specify, they always put 35. The door plate says 29 all round.

35 is like driving on cobblestones, as we 'ave in Lancashire, so I know!       29 is like a feather bed !

[HAKAPALITA]

1 hour ago, HAKAPALITA said:

Use the Dealership for Service.Tires set correctly.

Well they do mine OK, i go to Tyre Plus after a Service sometimes to make sure, not one to get my hands dirty messing around with Cars anymore. Bottle Opener thing i do check daily..

[Vacuum]

1 hour ago, Bredbury Blue said:

The inside plaque on my car refers to 33psi front/30psi rear.

Should give you a hint.

[Bredbury Blue]

1 hour ago, Vacuum said:

Should give you a hint.

You say that, but the posts above yours show many people dont follow the inside plaque of the car.

 

I'm also curious why pretty much all car maintenance places (my experience here) OVER inflate compared to the recommended.

 

And i read an article (can't find again now I'm  looking for it) which recommended an additional 20% over the plaque psi.

 

Hence my questions.

 

[Anythingleft?]

Have you thought of trying nitrogen, I hear it's all the rage nowadays.....

Sent from my SM-N950F using Tapatalk

[JAS21]

13 minutes ago, Bredbury Blue said:

You say that, but the posts above yours show many people dont follow the inside plaque of the car.

 

I'm also curious why pretty much all car maintenance places (my experience here) OVER inflate compared to the recommended.

 

And i read an article (can't find again now I'm  looking for it) which recommended an additional 20% over the plaque psi.

 

Hence my questions.

 

'Pub Car Mechanics' will give you a variety of opinions.

 

Do you not think the car designer knows best. Over inflated tyres have less contact area with the road ... is that good or bad for stopping quickly?

 

Same as keeping your tyres for years...the rubber hardens quite quickly here... do you think you car will stop as quick .. could mean the difference between just stopping in time and not  ... do you think tyres where the rubber has hardened will 'swerve' when needed as well as new tyres...

 

Stick with Trans ...... ignore those offering alternatives....stay safe

 

 

[Lacessit]

2 hours ago, Bredbury Blue said:

You say that, but the posts above yours show many people dont follow the inside plaque of the car.

 

I'm also curious why pretty much all car maintenance places (my experience here) OVER inflate compared to the recommended.

 

And i read an article (can't find again now I'm  looking for it) which recommended an additional 20% over the plaque psi.

 

Hence my questions.

 

Thai tire philosophy follows the principles of Thai doctors prescribing medications. More is better.

[jadatis]

This " pigheaded Dutch selfdeclared tire/tyre- pressure-specialist" registered to give an answer.

 

The 33/30 psi is most likely the pressure the carmaker calculated for max allowed axle- loads and for max technical car speed. 

So is alrrady eith a comfortable reserve for normal driving= only driver plus eventual copilot and for normal speed of below 140km/ 87m/h. 

Why most garages fill up to 40 psi is for simplicity , one pressure for every car so no thinking needed.

This 40 psi then will give low comfort and gripp, but better fuelsaving. 

Comfort is subjective, that your kidneys walk you are used to and think thats normal comfort.

On highway with asphalt, bumping wont be that much, so if you have no problems, keep it on 40 psi .

Steering can be a bit nervous at that pressure.

 

My tyrepressure-story becan on Dutch camperforum, when I got hold of the official formula and system from standards manual 2007 of ETRTO , and I went running with it.  Got much wiser in time about it , by googling and nagging people who knew more about it.

 

[Lacessit]

13 hours ago, Anythingleft? said:

Have you thought of trying nitrogen, I hear it's all the rage nowadays.....

Sent from my SM-N950F using Tapatalk
 

Nitrogen is a myth. Air is 80% nitrogen. Adding 20% more nitrogen does next to nothing.

There's a YouTube rant by John Cadogan, an independent Australian motoring journalist, on the subject of nitrogen in tires.

[Henryford]

13 hours ago, Anythingleft? said:

Have you thought of trying nitrogen, I hear it's all the rage nowadays.....

Sent from my SM-N950F using Tapatalk
 

I put in 80% nitrogen into my tyres.

[Anythingleft?]

I put in 80% nitrogen into my tyres.

Was going to try it myself but it sounds like a lot of effort....

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[mauroest]

I changed motorbike tyres. The mechanic just pump them hard like rock. At the first petrol station I checked pressure . It was 42psi, and must be 2.5 ????

[Briggsy]

9 minutes ago, mauroest said:

I changed motorbike tyres. The mechanic just pump them hard like rock. At the first petrol station I checked pressure . It was 42psi, and must be 2.5 ????

Motorbike tyres are a different shape to car tyres. 42psi is not unusual for a tubeless back tyre on a heavier bike. Too much for the front though. You could lose the front wheel going round a corner.

[jvs]

13 minutes ago, mauroest said:

I changed motorbike tyres. The mechanic just pump them hard like rock. At the first petrol station I checked pressure . It was 42psi, and must be 2.5 ????

Are you confused ?Difference between psi(usa) and bar (europe)

Here they also use psi.

[NanLaew]

15 hours ago, Bredbury Blue said:

I'm also curious why pretty much all car maintenance places (my experience here) OVER inflate compared to the recommended.

Forget about tire pressures. Pondering why the locals do anything remotely contrarian will only serve to increase your blood pressure.

[taichiplanet]

2 hours ago, Lacessit said:

Nitrogen is a myth. Air is 80% nitrogen. Adding 20% more nitrogen does next to nothing.

There's a YouTube rant by John Cadogan, an independent Australian motoring journalist, on the subject of nitrogen in tires.

Agree totally with what you say. i  hate to be picky (okay, i don't really)  but it is 78% (dry air and decreases when more humid). If it is an Australian journalist then it will be spelt 'tyres' not 'tires'. ????  Before i get bashed, the above is said in light humour (or in your case humor).

[Lacessit]

4 minutes ago, taichiplanet said:

Agree totally with what you say. i  hate to be picky (okay, i don't really)  but it is 78% (dry air and decreases when more humid). If it is an Australian journalist then it will be spelt 'tyres' not 'tires'. ????  Before i get bashed, the above is said in light humour (or in your case humor).

And I thought I was pedantic. But do continue, I'm not tired yet.

[HAKAPALITA]

I had Plaque inside my door, but Colgate fixed it.!.

[wgdanson]

Here's a thought. In UK the law says you must have your tyres (English) at the Manufacturer's Recommended Pressure. You can get fined or your insurance could refuse to pay out in the event of an accident proved to be caused by incorrect tyre pressure.

What about cars which, on the plate, say for example Rear pressure 30 psi empty, 35 psi loaded. Does that mean that before you take Granny and Grandad to the train station you must put anoth 5 psi in your tyres, and let them down again after they get out?