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Tyre Pressures 

 

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 Post subject: Tyre Pressures
Posted: Fri Sep 01, 2006 7:44 pm 
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Hey sounds like a stupid question but my mate said you shouldn't fill your tyres up to max, but a bit under otherwise they don't wear evenly. Is this true and how much under should you fill it if so?

 

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Posted: Fri Sep 01, 2006 9:43 pm 
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Unevenly??? I wonder how he expects tyres to wear at reccomended inflation??

Over inflation can wear out the middle of the tread first. But we are talking way over 40psi cold which would be dangerous in the wet anyway.
Under inflation will wear out the shoulders early!! The lower the pressure, the worse it will be. The outside shoulder will suffer even worse under cornering & you will use more fuel.

I have a set of tyres for the road & a set for the track. I use about 38psi cold in both in dry weather & still manage to wear out the outer shoulders first, even on the street set. I suppose I'm just cornering too hard. About 32 is good in the wet, but pump them back up when it dries out.

 

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Posted: Sat Sep 02, 2006 7:14 am 
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I set my tires up to 36, as thats what i was reccomended by the tyre place when i had them fitted. If you are unsure, just go ask those blokes, they deal with tyres for a living.

Have a good one 8-)

 

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Posted: Sat Sep 02, 2006 3:23 pm 
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usually run mine at around 40-42psi

 

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Posted: Sat Sep 02, 2006 3:27 pm 
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Posted: Sat Sep 02, 2006 3:54 pm 
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I run mine at 40psi. Thats for both my cars. One has 16" rims the other 17".

Check it every two weeks.

 

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Posted: Sat Sep 02, 2006 4:12 pm 
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I run my 225/60/15 tyres at 35 (cold),
front and rear.
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Posted: Sat Sep 02, 2006 6:13 pm 
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got my 18"'s on 49psi, thats what it says the max should be on the tyre.

fuel economy would improve the harder they are though right? less rolling resistance?

 

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Posted: Sat Sep 02, 2006 6:19 pm 
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Mash85 wrote:
fuel economy would improve the harder they are though right? less rolling resistance?

Yeah, but at the cost of grip, especially in the wet.

 

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Posted: Sat Sep 02, 2006 6:51 pm 
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i ran mine at 45psi and they just ripped apart.

i run 38psi all round

p.s. i run 225,16"s

 

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Posted: Sat Sep 02, 2006 7:05 pm 
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i have 40PSI in each tyre.... on 17" rims ... 235/ tyre
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Posted: Sat Sep 02, 2006 7:10 pm 
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i run 36psi all round back when i worked at a tyre joint
thats what we put in the tyres 34 - 36psi

 

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Posted: Sat Sep 02, 2006 7:14 pm 
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i run 40 psi on 235/45/17..
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Posted: Sat Sep 02, 2006 9:18 pm 
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I must say that all the ppl answering this question all have differnent ideas, which is only natural.

Let me say that, first off, the recommended tyre pressures set by the manufacturer (in this case, Ford), are in the issues of comfort. i.e.,: their recommended pressures are generaly low, giving a soft/comfortable ride.

It really depends what tyres u have, as to what pressures u run. If u have an ultra low profile tyre, u MUST run higher pressures, so the sidewall doesn't flex, thus creating heat, which is the enemy of all tyres. This, of course, sacrifice ride quality.

Different pressures will create different "handling" properties. One can play with the pressures between front and rear tyres, for example, run your fronts @ 36, and your rears @ 34 (psi), and see what happens. Reverse the pressures, and notice the difference.

In the "wet" it is actualy better to run the tyre at a higher pressure, as this opens the tread, and allows for better water dispersment.

Then we come to the argument between block tread patterns, and linear tread patterns. It is an undisputed fact that block tread patterns disperse water better than linear patterns. This has been proven by Michellin, Bridgestone, and others. (check their websites)

With the issue of wear, the Falcon has a "central" ball joint, which loads the outside of the tyre during cornering, by imposing a negative camber. This can be negated to a degree by the fitment of an adjustable upper control arm link, but I must refer you to the latest "Wheels" for more info. (refer new Holden)

All in all, tyre are really a personal choice. If you want super sticky gumball tyres, you pay for them, again and again. If you want longivity from you tyres, you sacrifice other properties, such as wet weather braking, and grip ( Bob Janes "All Rounders" the taxi favourites)

IMHO, silicon is the way to go.

BTW, if someone says my tyres are better than yours, ask them to prove it
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