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Old 22-04-2009   #1
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Tyre pressures

i cant seem to find a definitive pressure i should pump my tyres up to. the back of the car has been feeling a bit loose round corners recently and i think its cause the pressures are a bit low. i drive a 1999 sporting so it has the smaller wheels than the abarth. i mean to upgrade to the wheels sometime but dont have the cash right now.

thanks
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Old 22-04-2009   #2
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Re: Tyre pressures

Somewhere between 30 and 32 psi, front and rear will be in the ballpark.
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Old 22-04-2009   #3
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Re: Tyre pressures

If you don't like how it feels try lowering the tyre pressure and see if that helps, if it does lower it a bit more, if it doesn't then put a little more pressure in than you had originally. Just feel around like that, eventually you'll find a pressure that if you go up or down from it gets worse, that's the tyre pressure for ideal handling.

The other way is to do the same but with tread depth, this may or may not end up giving the same tyre pressures.
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Old 22-04-2009   #4
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Re: Tyre pressures

Vech Hand book for '98 sporting says
for 165-55R13
cold
medium load
front 2.1
rear 2.0
full load
front 2.3
rear 2.3
spare
2.8
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Old 22-04-2009   #5
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Re: Tyre pressures

remeber that's bar not psi :P

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Old 22-04-2009   #6
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Re: Tyre pressures

Handling also depends on the age of the tyre. Sidewalls can lose their rigidity, so even if the pressure is right, the tyre flexes more than it did.

Cheers

SPD
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Old 22-04-2009   #7
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Re: Tyre pressures

Hi Ming

x 14.5

Noel
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Old 22-04-2009   #8
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Re: Tyre pressures

x 14.5037738

cheers

The pedant
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Old 22-04-2009   #9
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Re: Tyre pressures

Quote Originally Posted by rallycinq View Post
Handling also depends on the age of the tyre. Sidewalls can lose their rigidity, so even if the pressure is right, the tyre flexes more than it did.

Cheers

SPD
Hi David
You said the rear metal elastics will pass a MoT even when they are in a terrible state, that would not help handling either?
Noel
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Old 22-04-2009   #10
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Re: Tyre pressures

Quote Originally Posted by rallycinq View Post
x 14.5037738

cheers

The pedant
Hi

No 'David the tease' the tyre gauge even if it is digital wont show that many digits?

Noel
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Old 22-04-2009   #11
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Re: Tyre pressures

told already at "cheap tyre choice" topic, iam inflating to 2.6bar F/R and back is pretty nervous at cornering and breaking is making it worse-i think this is supsension cause not tyres
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Old 22-04-2009   #12
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Re: Tyre pressures

Hi

2.6 is a little high

The police in UK can check inflation in the UK, especially after an accident.

Have you tried the recommended pressure, braking distance in wet must be better softer?

Noel
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Old 22-04-2009   #13
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Re: Tyre pressures

you wouldnt exceed max pressure written on tyre(3 bar)
police cant threat you if ullhave 2.6-i think its normal to inflate to 2.6 when heavy loaded, or driving high speeds for long period of time

high pressure will lead to worn middle tread, but xr611s are mostly worn on outside, this could help it
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Old 22-04-2009   #14
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Re: Tyre pressures

Hi

I understand the logic but, your outside wear is either

- you are cornering to fast
- or have wheel tracking or other suspension problems

If you are cornering too fast then the increased tyre pressure will only have a marginal effect on the outside wear, it will only wear the middle when you are accelerating or braking in a straight line.

2.6 is more then the full load pressure recommended by Fiat for your tyre configuration.

In the wet the tyre foot print on the ground will be reduced by the increased pressure with a greater tendancy to aquaplane, if you aquaplane a tyre you dont have any control.

Noel
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Old 22-04-2009   #15
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Re: Tyre pressures

I usually run 2.2Bar Front & Rear.
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