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Thread: are 235/40 R18 tyres ok on a vec c?

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    Regular Member mike.'s Avatar
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    Vehicle : Vectra

    Trim : SRi NAV

    Engine : 1.9 CDTi 120

    Year : 2005

    Default are 235/40 R18 tyres ok on a vec c?

    as title really,i assume this size would be ok?
    cheers

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    Regular Member chewy71's Avatar
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    rolling diameter results in 15mm less overall against the factory stock size of 225/45/18- not for me but would just look like a smaller wheel on the car (more arch gap) and also a speedo inaccuracy.

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    Regular Member mike.'s Avatar
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    would that be compared to a 225/45 18?

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    Regular Member mike.'s Avatar
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    Quote Originally Posted by chewy71 View Post
    rolling diameter results in 15mm less overall against the factory stock size of 225/45/18- not for me but would just look like a smaller wheel on the car (more arch gap) and also a speedo inaccuracy.
    ignore my last post,read yours again properly!lol

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    Regular Member mike.'s Avatar
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    i have been offered some 18s with this size tyre fitted.

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    you change the wheel diameter specs with the likes of tech 2, or less talked about readers

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    Quote Originally Posted by mike. View Post
    ignore my last post,read yours again properly!lol
    whats wrong with my post? A vec which comes with 18" wheels has 225/45/18 fitted. 235/40/18 does not have the same overall dimensions or diameters. i.e. 15mm less overall diameter.

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    Regular Member mike.'s Avatar
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    Quote Originally Posted by chewy71 View Post
    whats wrong with my post? A vec which comes with 18" wheels has 225/45/18 fitted. 235/40/18 does not have the same overall dimensions or diameters. i.e. 15mm less overall diameter.
    nothing wrong with your post mate it was my eyes!was talking to the missus as i was reading it and completely misread it!lol

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    Regular Member chewy71's Avatar
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    will be fine I'm sure, just your speedo will be out a tad, and look a little smaller than stock.

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    Regular Member Signum-Steve's Avatar
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    With 235/40/18 your speedo will be 2.3% out, your speedo will read to fast, eg when your speedo is reading 60mph you will be traveling @ 58.6 mph Or there about lol

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