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Author Topic: extra load tyre pressure question  (Read 5406 times)

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tigers_gonads

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Re: extra load tyre pressure question
« Reply #30 on: 05 September 2018, 20:32:55 »
33 in the back
32 in the front on my estate with a gas tank in the wheel well.
Rises the 34 in the back if carrying any real load.
Can confirm it drove straight and true and a steady 80 plus a little bit  :-X last weekend 
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TheBoy

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Re: extra load tyre pressure question
« Reply #31 on: 06 September 2018, 10:05:46 »
Quote from: Doctor Gollum on 05 September 2018, 19:31:42
Which begs the question as to why GM bothered to establish optimum pressures and included them in the handbook... ???
The optimal (although all cars vary, as do tyres, so worth experiementing) is the normal load.  The high load/high speed is to reduce chances of tyre failure due to the extra stress, rather than "optimal" ;)
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TheBoy

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Re: extra load tyre pressure question
« Reply #32 on: 06 September 2018, 10:06:54 »
And "high speed" generally refers to over 100mph, so not a worry with Blighty's maximum 70mph limit.  So just the load....
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