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Thread: Tyre Size.

  1. #1
    Regular Member padawun's Avatar
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    Default Tyre Size.

    I have a Vec.C 2.0t fitted with 215/50-17 tyres, I need to replace a couple of tyres before the MOT is done in December, I am told and Read in total Vauxhall this month that a common tweak is to fit 225/45-17 instead. (okay so long as they are fitted as a pair on the same axle).

    My chosen treads are the Vrededtein Sessanta, which are only available in 225/45.

    Has anyone done this mod, are there issues with wheel arch clearance or speedo calibration.

  2. #2
    Regular Member ghostrider's Avatar
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    Vehicle : 2.0l CDTi Bi-Turbo Insginia Sports Tourer

    Trim : Vx Line Nav Sri

    Engine : 2.0

    Year : 2014

    Default

    If they are fitted on the front, then yes. The rolling radius will be smaller, thus the speedo and range will be out by a factor, but you will have no issues with clearance.

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    Quote Originally Posted by ghostrider View Post
    If they are fitted on the front, then yes. The rolling radius will be smaller, thus the speedo and range will be out by a factor.
    slower or faster??

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    Regular Member mhvcbv's Avatar
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    Quote Originally Posted by padawun View Post
    I have a Vec.C 2.0t fitted with 215/50-17 tyres, I need to replace a couple of tyres before the MOT is done in December, I am told and Read in total Vauxhall this month that a common tweak is to fit 225/45-17 instead. (okay so long as they are fitted as a pair on the same axle).

    My chosen treads are the Vrededtein Sessanta, which are only available in 225/45.

    Has anyone done this mod, are there issues with wheel arch clearance or speedo calibration.
    hi m8
    no adjusting needed
    as the total hight of wheel and tyre stays the same as your old ones.
    225 is the mm width and 45 is the % of the width to the hight of the tyre.
    they will be fine m8

  5. #5
    Regular Member ghostrider's Avatar
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    Vehicle : 2.0l CDTi Bi-Turbo Insginia Sports Tourer

    Trim : Vx Line Nav Sri

    Engine : 2.0

    Year : 2014

    Default

    I always thought that 45 was the 'thickness' of the tyre. i.e the height above then rim? - Hence the reduced rolling radius.

    Thats what the tyre dealer told me. He showed me a simulation on the computer and said that running 225 45 R17 would make my speedo run faster? Also that my MPG would suffer, using more fuel per revolution of the tyre. The effect is minimal, but there.

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    Regular Member mhvcbv's Avatar
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    Quote Originally Posted by ghostrider View Post
    I always thought that 45 was the 'thickness' of the tyre. i.e the height above then rim? - Hence the reduced rolling radius.

    Thats what the tyre dealer told me. He showed me a simulation on the computer and said that running 225 45 R17 would make my speedo run faster? Also that my MPG would suffer, using more fuel per revolution of the tyre.
    yes it is the thickness from the rim in % of the width.

    IT WILL STILL BE THE CORRECT HIGHT AND NO ADJUSTING OF THE SPEEDO IS NEEDED

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    changing from 215/50 to 225/45 does not make any difference to fuel cons or the spedo... i did this on my last Vec & when the tyres wear out on my current, i will be doing the same.

    hth

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    Regular Member mhvcbv's Avatar
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    use this
    and put your old tyre size in an then do your new one
    http://www.etyres.co.uk/tyre-size-calculator.htm

  9. #9
    Regular Member ghostrider's Avatar
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    Vehicle : 2.0l CDTi Bi-Turbo Insginia Sports Tourer

    Trim : Vx Line Nav Sri

    Engine : 2.0

    Year : 2014

    Default

    Well, there is slight difference. - 13mm diameter or - 2.01%.

    So i guess if you drove 40K a year, then you would notice it (fuel wise)
    But otherwise, as you say, no real change. As at 70mph, your speedo would only be 1.4mph out (high I think)

  10. #10
    Regular Member padawun's Avatar
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    Thanks for the info guys, I found a tyre calculator on a different website,
    it lists the overall as 13mm or 2.01%. Given that the speedo is
    about 5% out at 90mph compared to my Road angel, I assume that would make it more accurate.

    235/45-17 are listed as 4mm or 0.62% different, but will they clear the arches.

    Another question, by changing the aspect ration on the tyres, am I in danger of putting abs faults in to the system.

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