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Thread: 225/45/18 tyres

  1. #1
    Regular Member davidlewis24's Avatar
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    Default 225/45/18 tyres

    hi everyone just a quick question i have 18inch vxr reps and i need a set of tyres i have 225-45-18 on at the moment but what other options do i have size wise ? could i fit 225-40-18 as they seem alot cheaper thanks in advance

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    VIP-Member happypostie's Avatar
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    Vehicle : insignia vxr

    Trim : vxr

    Engine : 2.8 turbo

    Year : 61

    Mileage : 38000

    Default

    yes you can fit 225/40/18 . ive got the same wheels ans ive got 235/40/18 on mine . khalid

    the vectra has gone , but not far away so ill still see it form time to time

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    Regular Member davidlewis24's Avatar
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    Quote Originally Posted by happypostie View Post
    yes you can fit 225/40/18 . ive got the same wheels ans ive got 235/40/18 on mine . khalid
    thanks khalid

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    Regular Member MAF 3.2 V6 GSi's Avatar
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    235/40/18 are the best fit mate

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    Full Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

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    Default

    225/45/18 are the best fit as they help fill the arches.

    225/40/18 is the wrong size and your speedo will be out. Check the manual and you will notice there is no mention of this size for 18's

    what width are your alloys?

    If you want to run 235/45/18 then you really need an 8J

    Trying to run a 235 on a 7J or 7.5J is not ideal
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

  6. #6
    Regular Member davidlewis24's Avatar
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    Quote Originally Posted by merikiito View Post
    225/45/18 are the best fit as they help fill the arches.

    225/40/18 is the wrong size and your speedo will be out. Check the manual and you will notice there is no mention of this size for 18's

    what width are your alloys?

    If you want to run 235/45/18 then you really need an 8J

    Trying to run a 235 on a 7J or 7.5J is not ideal
    i had better stick with 225/45/18 worth asking thanks for all your help

  7. #7
    Full Member Big Sig's Avatar
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    I ran 225/40/18's. No problems with them at all. 235/40's are closer to the OE size of 215/50/17 than the 225/45/18.
    Now I need a turbo to keep up!

  8. #8
    VIP-Member happypostie's Avatar
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    Vehicle : insignia vxr

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    Engine : 2.8 turbo

    Year : 61

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    Quote Originally Posted by Big Sig View Post
    I ran 225/40/18's. No problems with them at all. 235/40's are closer to the OE size of 215/50/17 than the 225/45/18.
    this was why i went for the 235/40 /18 on mine , and they are the vxr reps . khalid

    the vectra has gone , but not far away so ill still see it form time to time

  9. #9
    Regular Member rockafella8587's Avatar
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    http://www.miata.net/garage/tirecalcold.html
    Try this calculator, it gives you exact figures between 2 different sizes!

  10. #10
    Regular Member Signum-Steve's Avatar
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    I use 225/40/18 on my car on a 8j wheel. They were the closest match according to the online calculator I used. I have no problems at all.

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