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View Poll Results: how big would you go

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  • 225 / 40 / 18

    4 13.79%
  • 235 / 40 / 18

    7 24.14%
  • 245 / 40 / 18

    11 37.93%
  • 255 / 40 / 18

    7 24.14%
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Thread: i needed tyers so what do you think i put on

  1. #1
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    Default i needed tyers so what do you think i put on

    come on iv gone and done it but what did you think i did

  2. #2
    Regular Member swainey's Avatar
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    245s

  3. #3
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    Quote Originally Posted by swainey View Post
    245s
    hell have you seen my car

    iv got to say the drive is so smooth compared to the 225 and neck breaking in the corners

  4. #4
    Regular Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

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    I think you should have had 45/18's on your list as I dont think 40/18 is the right size. Not on mine anyway
    What J are your alloys?

  5. #5
    Regular Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

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    For 245's u need 8.5j I would have thought or at least 8J

  6. #6
    Regular Member cameraman's Avatar
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    225/45 18 is the normal size put on the Vec, but if you're wider then a 40 profile is fine 245/40 18 is what's on the Insignia iirc

  7. #7
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    my wheels are 8 j

    as for the size there spot on for the 215/50/17 but the the 245/40/18 but the 245 are wider so my speedo is still spot on to


    215/50/17 elite spec revs per mile is 792
    245/40/18 elite spec revs per mile is 784

    so my speedo is going to be 0.6% slow so as you can see its so very very close on the speedo

    http://www.miata.net/garage/tirecalc.html

  8. #8
    Regular Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

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    Yes but what width is the alloy (J)?
    245 should not be fitted to a 7J or 7.5J, still a bit close on a 8J

    Edit: seems we posted at the same time lol
    Last edited by merikiito; 15th February 2009 at 13:49.

  9. #9
    Regular Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

    Default

    the ideal width for a 245 is 8.5 I think but you can get away with it on a 8j which would be the minimum width

    I have 235/45/18's on my 8J's and its spot on the recommendation for width.
    As for using a tyre calculator its fine to get a rough idea, but it also depends on the setting in the ECU for tyre sizes.
    Using my satnav as a reference my speedo is spot on, but I did change the settings in the ECU several times to get the correct reading

    And yes I agree with you as regards grip. I cannot get mine to lose any when throwing round bends. Big difference to the 215 rubber bands fitted as standard

  10. #10
    Regular Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

    Default

    Quick check here http://www.toyo.co.uk/productdetail....s&product_id=2 says 245/40's should be fitted to minimum 8J to max 9.5
    I think I would go for at least a 8.5J for this size

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