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Thread: Tyre Presure for non standard 18's.

  1. #1
    Full Member coldo's Avatar
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    Default Tyre Presure for non standard 18's.

    Hey all,

    I have a set of 18" Vaxuahall Astra Penta's on my vectra at present. I was trying to work out what I should be filling them to but can't find a recomended figure for the old girl... At present I am running them with 36 psi in each tyre.

    The tyre size is 225/40R18

    Thanks
    C

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    As a rule just double the rim size

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    Full Member coldo's Avatar
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    Ah... 36 PSI then.... Result...

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    Regular Member cossiejay's Avatar
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    Vehicle : vectra

    Trim : sri 150

    Engine : 1.9 cdti

    Year : 2007

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    autodata cd says 33 in all for the 1.9 cdti

  5. #5
    Full Member coldo's Avatar
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    Quote Originally Posted by cossiejay View Post
    autodata cd says 33 in all for the 1.9 cdti
    This is where my confusion is comming from as the wheel size on the Astra is different to the Vectra. I think from memory the 225/40/R18 is the Astra size (and what I fitted to the Vectra) where as 18s on the Vectra are 225/45/R18 (although I may be wrong here...)

    Mine is the 1.8 also...

    I guess filling them to 36 is reasonable given the wheel size as per the advice earlier...

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    Trim : SXi

    Engine : 2.2


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    I put 40psi in mine, been doing that for years on different cars that I've run 18,s on. Reason is you normally lose a couple of psi in the first week or so due to air temp (You lose pressure quicker in the summer)

  7. #7
    Regular Member Marc Hutton's Avatar
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    Putting 40 in mine as well.

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