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Thread: Tyres

  1. #1
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    Default Tyres

    Hi,

    Am i ok to run 225/45/17's on my 17" pre facelift sri alloys??

    If so do i need to change all four at same time or could i do an axle at a time??

    Thanks for any advice

    Nick

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    Regular Member Gsi3.2's Avatar
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    they are okay on width for the rims, but 45's will affect the accuracy of the speedo readings..they will be 1.9% out, so when the speedo displys 60mph you will in fact be doing 58.8mph... all perfectly legal as you have a 10% tolerance..

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    Regular Member um20's Avatar
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    Yep, all okay I think. The facelift manual even quotes tyre pressures on 17" alloys for 215/50 and 225/45, so they must be okay I guess.

    And AFAIK you can just change 1 axle at a time, but not sure if there's a specific order you should do them (e.g. new, wider tyres at the rear). That would make sense I think, so if you're getting them for the front get the fitters to swap your rears for your fronts perhaps (other's will have done this and know more).

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    thanks for the info - the speedo could do with pulling back a bit tbh. It appears to be using it's full 10% tolerance at present i.e. when sat nav says 70 - speedo reads 77ish.

    Any more thoughts on changing 1 axle though? Will this affect stability having different profiles?

    Most of my miles are done on country roads - 120miles a day round trip to work :-(

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    Regular Member Gsi3.2's Avatar
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    changing one axle will have no bad affects to your car, it's quite normal practice..

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    Regular Member wardy's Avatar
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    Quote Originally Posted by Nickzx6r View Post
    Any more thoughts on changing 1 axle though? Will this affect stability having different profiles?

    Most of my miles are done on country roads - 120miles a day round trip to work :-(
    I did this, putting the 225s on the back without any problems.

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by Gsi3.2 View Post
    they are okay on width for the rims, but 45's will affect the accuracy of the speedo readings..they will be 1.9% out, so when the speedo displys 60mph you will in fact be doing 58.8mph... all perfectly legal as you have a 10% tolerance..
    No they don't, the EU conformity for the Vectra C is based on the 205/55R16, the 225/45R17 is closer than the 215/50R17
    VX chose the 215/50R17 as it looks better on the wheel, when matched to the car

    I had this checked by VOSA on Saturday morning after the new tyres were fitted
    215/50R17
    Indicated 40mph = calibrated 39.2mph
    225/45R17
    Indicated 40mph = calibrated 38.6mph

    Quote Originally Posted by um20 View Post
    Yep, all okay I think. The facelift manual even quotes tyre pressures on 17" alloys for 215/50 and 225/45, so they must be okay I guess.

    And AFAIK you can just change 1 axle at a time, but not sure if there's a specific order you should do them (e.g. new, wider tyres at the rear). That would make sense I think, so if you're getting them for the front get the fitters to swap your rears for your fronts perhaps (other's will have done this and know more).
    I am in the process of changing from Good Year NCT5 XL 215/50R17 95W 240/A/A to Good Year F1 GSD3 XL 225/45ZR17 94W 280/AA/A
    The GSD3 has a narrower footprint on the road, and this can make the back end a bit twitchy on high speed cornering
    The treadwear rating on the GSD3 is also 16% higher, so should last longer
    The 225/45R17 also looks skinnier than the 215/50R17 when fitted to the car

    I swap wheels rear to front at they wear, the NCT5 wore out this week, so the GSD3 went on to the rear on Saturday morning
    The fitter I used asked if I was sure, as their listing doesn't show the 225/45R17 for any of the Vectra C, but I showed him the manual and my calculations from the EU Conformity
    "Blimey, you've done your homework on these, let us know how they go, as they are £50 cheaper each!"

    From the limited road testing I carried out yesterday, the road noise is also much less, the rear of my car is much quieter now

    I will also take a photo of the wheels shortly so that you can compare how the wheels look with the 215/50R17 and the 225/45R17
    Last edited by m8internet; 1st April 2007 at 13:41.

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    Regular Member Gsi3.2's Avatar
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    right, well i hear what you're saying, but the figures i've given come from the tyre size calculator listed on this site..

    http://www.miata.net/garage/tirecalc.html
    Last edited by Gsi3.2; 1st April 2007 at 14:54.

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    Regular Member m8internet's Avatar
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    You need to compare both tyres against the 205/55R16, that is what the speedo is calibrated for
    Recheck on the tyre size calculator
    As you will see the 215/50R17 is way out!

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    Quote Originally Posted by m8internet View Post
    No they don't, the EU conformity for the Vectra C is based on the 205/55R16, the 225/45R17 is closer than the 215/50R17
    VX chose the 215/50R17 as it looks better on the wheel, when matched to the car

    I had this checked by VOSA on Saturday morning after the new tyres were fitted
    215/50R17
    Indicated 40mph = calibrated 39.2mph
    225/45R17
    Indicated 40mph = calibrated 38.6mph

    christ you need to get out more!
    Now I need a turbo to keep up!

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