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Thread: 18" Tyre advice

  1. #1
    Regular Member leeds vectra's Avatar
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    Vehicle : Insignia

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    Year : 2014

    Default 18" Tyre advice

    Wanting to get a clear way to go for tyre replacement. I can't really suss which is the best way to go. I run my hatch on 18" VXR snowflake alloys which were transferred from a Zafira VXR.

    The Zafira alloys have the factory fit 225/40/18 92Y XL sport contact 2 tyres fitted, they have a bit of life left but I'm not sure which way to go come replacement.

    The Vectra VXR runs the same wheel as standard but with 235/40/18. The Vectra hatch tyres are not XL so I realise I won't need them when replacing.

    I'm happy with the handling of the 225's but which way should I go to the book when replacing them. The Vauxhall handbook lists 235/40/18 for the VXR wheel, but mines not a VXR!

    The only other option listed is 225/45/18. This is listed for the 1.9cdti optional 18" wheel. This is the way I'm swaying but as a few have pointed out on here the Vauxhall multispoke optional 18" wheel is 7.5 inches wide, the 18" snowflake is 8" wide.

    I would appreciate some opinions and advice then I can make a decision.

    Cheers,

    Paul.

  2. #2
    Regular Member cameraman's Avatar
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    I had the 18" wheel upgrade on the 1.9CDTI design, the tyres were 225/45/18 XL originals were Bridgestone Potenza & I've also had Michelin Pilot Sports of the same spec. I'd recommend the Michelins but they ain't cheap

  3. #3
    Regular Member leeds vectra's Avatar
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    Default

    Just noticed on a few tyre sites that there is around £30 difference between the 40 & 45 profiles on the 225's.

    Will I need XL's then?

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    Regular Member glenboy's Avatar
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    I have 225/40's on my Boss alloys and find the handling great, if i were you i would stay with 225/40's,you know they handle ok, so stick with what you know, but i'm sure someone else will have an opinion, good luck with your dilemma......
    Last edited by glenboy; 3rd July 2008 at 10:31.

  5. #5
    Regular Member leeds vectra's Avatar
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    Quote Originally Posted by glenboy View Post
    I have 225/40's on my Boss alloys and find the handling great, if i were you i would stay with 225/40's,you know they handle ok, so stick with what you know, but i'm sure someone else will have an opinion, good luck with you dilemma......
    Cheers Glen, I'm swaying that way now as the price difference between 40 & 45 profiles is crazy for the same width tyre!

  6. #6
    Regular Member m8internet's Avatar
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    I've done a bit of number crunching for you, and the vehicle weight is just under that required for XL tyres, so you don't need them
    However, I would probably recommend it, the same dilemma as I had when replacing my tyres as the 3.0 V6 CDTI hatchback doesn't need them but I have decided to stay with XL tyres and in some cases they are the same price as standard tyres

  7. #7
    Regular Member leeds vectra's Avatar
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    Quote Originally Posted by m8internet View Post
    I've done a bit of number crunching for you, and the vehicle weight is just under that required for XL tyres, so you don't need them
    However, I would probably recommend it, the same dilemma as I had when replacing my tyres as the 3.0 V6 CDTI hatchback doesn't need them but I have decided to stay with XL tyres and in some cases they are the same price as standard tyres
    Cheers for that, I'm probably going to need XL'S then as my car has quite a few extra options that will push the weight up, sunroof & irmscher kit and other added extras.

    Out of interest what's the break point for needing XL'S? I'll get on my works weighbridge at the weekend to check!

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    Regular Member vectragsi3.2's Avatar
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    ive read a few people go from 225/45 to 225/40 because of the price difference!! ive got 225/40/18 falken 452's on my ace wheels. they are one of the best tyres ive had and for £75 a corner you cant go wrong!!!!

  9. #9
    Regular Member m8internet's Avatar
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    Quote Originally Posted by leeds vectra View Post
    Out of interest what's the break point for needing XL'S? I'll get on my works weighbridge at the weekend to check!
    The weight limit is 1680kg
    The axle limit (front) is 620kg
    Above that you need XL tyres

  10. #10
    [Ex]Admin Duncan's Avatar
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    225/40/18 is a more common size Paul, hence why you're finding the 225/45/18 is more expensive - same as the case with the 225/45/17 and 215/50/17

    I've got 225/40/18 (Michelin PS2) on mine and there's no issue with the profile - in fact I think they look a bit better. The 40's will have an ever so slightly firmer ride than the 45's, but I think you'd be hard pushed to notice it.

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