General Tyre pressure

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General Tyre pressure

its rule of thumb passed onto me by people who know a lot more about suspension an tyre set up than you or i

So you just accept what people say as gospel? You don't even know the reasoning behind it so why bother passing the info on if you can't back it up.
 
The pressure is measured in Pounds Per Square Inch, so it doesn't matter how big the tyre is. Its not measured in Pounds Per Tyre.

I have always stuck 30 psi in my punto's and 34 psi when we're going camping as the car is heavier. I have never experienced any unusual tyre wear so that does me.

But just for the record the manual say:

1.9 JTD
Tyres: 185/60 R14 82H

Standard Inflation:
2.2 Bar on the front (31.90 PSI)
2.1 Bar on the rear (30.45 PSI)

Fully Laden Inflation:
2.4 Bar on the front (34.80 PSI)
2.3 Bar on the rear (33.35 PSI)

Space Saver Spare Wheel:
4.2 Bar (60.91)
 
The pressure is measured in Pounds Per Square Inch, so it doesn't matter how big the tyre is. Its not measured in Pounds Per Tyre.

Exactly, why is why I wanted dave to explain his clearly flawed statement.
 
But just for the record the manual say:

1.9 JTD
Tyres: 185/60 R14 82H

Standard Inflation:
2.2 Bar on the front (31.90 PSI)
2.1 Bar on the rear (30.45 PSI)

Fully Laden Inflation:
2.4 Bar on the front (34.80 PSI)
2.3 Bar on the rear (33.35 PSI)

Space Saver Spare Wheel:
4.2 Bar (60.91)

my handbook says 2.4 front, 2.1-2.3 rear and 2.8 spare

i always use 2.4 front and 2.2 rear with all wheel tyre sizes
 
that is what i used to say until the experts told me otherwise.

fiat themselves list diferent presures for diferent sizes
They don't actually. Its not the sizes of the tyres that have different pressures, its the cars they're on.

In my mk2 handbook (which is right here *waves handbook*)

185/55 R15 81V on a SPORTING 2.2 bar front and 2.1 bar back
185/55 R15 81V on a 1.8 16v 2.4 bar front and 2.1 bar back

Same tyre, different car different pressure

also on the sprting they did a 185/60 R14 and a 185/55 R15 Different sizes, both have the same pressure.
 
Here is my manual for the mk2 (99-03):

(click so you can read it)
P050709_22.30.JPG
 
oh well fiat never get their presures right any way that why you got books that tell you difrent things an stilo section is full of threads about tyre edge wear, if i run my 17s at what fiat says for the 15s i get edge wear and use more fuel, but after adjusting as advised by elite they wear even an get better mpg
 
oh well fiat never get their presures right any way that why you got books that tell you difrent things an stilo section is full of threads about tyre edge wear, if i run my 17s at what fiat says for the 15s i get edge wear and use more fuel, but after adjusting as advised by elite they wear even an get better mpg
Can't disagree with that, I put 30 all round and never have any issues
 
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