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Thread: Wheel size

  1. #1
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    Default Wheel size

    Lo all, quick question, I have standard 17" wheels fitted, am thinking (still trying to convince long haired sarnt major) about getting newer, nicer possibly bigger wheels.

    If I go up to say 18 or 19" do I need to adjust any thing or do they just bolt on as per normal wheel change?

    Will my turning circle be greatly reduced?

    these may seem daft to people that know but its something I have never considered before and now I have been bitten by the modding bug, my life is over

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    Regular Member Pecojess's Avatar
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    they'll just bolt on m8, wont affect the car too much, ride may suffer a little mind u!!

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    Full Member neverlandandy's Avatar
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    Vehicle : Insignia Elite Nav

    Trim : Elite

    Engine : 2.0 cdti

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    i got more road noise going up to 18's but that may just be down to the tyres

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    Cheers lads, now to find me a set of wheels........................................

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    Quote Originally Posted by shamus5178 View Post
    Lo all, quick question, I have standard 17" wheels fitted, am thinking (still trying to convince long haired sarnt major) about getting newer, nicer possibly bigger wheels.

    If I go up to say 18 or 19" do I need to adjust any thing or do they just bolt on as per normal wheel change?

    Will my turning circle be greatly reduced?

    these may seem daft to people that know but its something I have never considered before and now I have been bitten by the modding bug, my life is over

    Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate

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    Regular Member KSD's Avatar
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    Quote Originally Posted by Guyver1 View Post
    Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate

    How come?

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    Quote Originally Posted by KSD View Post
    How come?
    In simple terms (so I can understand it)

    if your 17" wheel is 36" around the circumfrence (complete guess)

    a 19" wheel might 40" around the circumfrence

    so the rolling circumference will be out by quite a margin

    http://www.ajdesigner.com/fl_tire/tire.php

    this site explains it in more technical style mate



    In fact you can select your tyre and wheel size on that site and the difference between a 17" and 18" is actually close to 80mm longer circumference
    Last edited by Guyver1; 22nd April 2009 at 20:02.

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    Quote Originally Posted by Guyver1 View Post
    Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate
    depends on the overall diameter of the wheel/tyre combined

    a 215/50/17 isnt a great deal different to a 235/35/19

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    Quote Originally Posted by tom_p_2000 View Post
    depends on the overall diameter of the wheel/tyre combined

    a 215/50/17 isnt a great deal different to a 235/35/19

    Yeah thats true, 0.1 mph speedo error aint too bad

  10. #10
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    Quote Originally Posted by Guyver1 View Post
    In simple terms (so I can understand it)

    if your 17" wheel is 36" around the circumfrence (complete guess)

    a 19" wheel might 40" around the circumfrence

    so the rolling circumference will be out by quite a margin

    http://www.ajdesigner.com/fl_tire/tire.php

    this site explains it in more technical style mate



    In fact you can select your tyre and wheel size on that site and the difference between a 17" and 18" is actually close to 80mm longer circumference
    I didnt realise the speed sensor measured wheel speed, I thought it would sense the speed of the driveshaft but just had a blonde moment I think because it would have to measure wheel speed to communicate with the ABS control unit right? ie rapid decceleration of a wheel would cause the ABS to release the brake pressure on that wheel.

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