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Thread: Tyre pressure

  1. #1
    Regular Member jun's Avatar
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    confused Tyre pressure

    Im going for nice long drive to lands end monday and want to give me car a once over before going. And wondered whats the correct psi for my tyres they are 235/45 /17.
    cheers guys.

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    Regular Member fredfox_uk's Avatar
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    Rule of thumb I've always used is double the wheel size and +2 so I use 36 on mine.

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    Regular Member Ben999's Avatar
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    according to the manual 32, but I do usually go for the double +2 option.

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    Regular Member Tadpole's Avatar
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    Quote Originally Posted by fredfox_uk View Post
    Rule of thumb I've always used is double the wheel size and +2 so I use 36 on mine.
    Quote Originally Posted by Ben999 View Post
    according to the manual 32, but I do usually go for the double +2 option.
    Easy to remember, always worth a check when you stop for a break to see how they are doing hth ..........

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    Regular Member RhayaderSax's Avatar
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    Look in the manual. The double plus two is a good rule of thumb if you're topping up a "squidgy" on an unfamiliar car but remember stuff like the fronts on a diesel will typically be higher psi to compensate for the heavy lump under the bonnet.

    Saying that I pump mine up to what the manual says & it feels too hard when driving. Every rabbit poo in the road feels like I've run over an elephant. Book minus 2 psi works for me (and I do a lot of driving on twisty roads) although even the first time I read the book figures for the 3.0 diesel they seemed a bit on the high side.

  6. #6
    Full Member gibbon7000's Avatar
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    As i found out a couple of weeks ago when i asked the same question, double the wheel size +2. hth

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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    Regular Member jun's Avatar
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    Thanks for the help guys.

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    i wa surprised that when i looked in my manual it told me 34 for the fronts and 46 for the rears!! for long drives fully loaded!

    When u pass over the Tamar Bridge entering cornwall look left and u may spot me
    Last edited by Diet1985; 5th April 2009 at 10:36.

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    235/45? Wrong size of tyres. 225/45 or 215/50.

  10. #10
    Regular Member kenp's Avatar
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    Vehicle : Vectra C


    Engine : 2.2 Direct

    Year : 2004

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    Quote Originally Posted by _ZS_ View Post
    235/45? Wrong size of tyres. 225/45 or 215/50.
    yes they are.. but then they are actually the same size as if you used 215/55 16"

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