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Thread: Tyres

  1. #1
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    Default Tyres

    Will it cause handling problems if I put 225-50-17's on the back and 215-50-17's on the front?

    Thanks in advance

  2. #2
    Regular Member Mr Owens's Avatar
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    Vehicle : Vectra

    Trim : Sri

    Engine : 2.2 direct

    Year : 2004

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    You won't have any problems, I've been running 225/50r17 on the rear (were laying around at work)for the past 3.5k miles 225/45r17's would be better as they have the same rolling diameter as the standard 215/50r17's but as long as they are the same size on each axle there's no problems

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Quote Originally Posted by Mr Owens View Post
    225/45r17's would be better as they have the same rolling diameter as the standard 215/50r17's
    Not quite. The 225's have a slightly smaller rolling diameter.

    At an indicated 60mph on 215's, with 225's the speedo will indicate 58.8mph.

  4. #4
    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 72K

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    I ran 225's on the rear and 215's on the front for 2 years on my previous car without any problems.

  5. #5
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

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    Quote Originally Posted by Big Dave View Post
    Not quite. The 225's have a slightly smaller rolling diameter.

    At an indicated 60mph on 215's, with 225's the speedo will indicate 58.8mph.
    Unless you change it via Tech2 or Vauxcom

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    Vehicle : Vauxhall Astra-J

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    Quote Originally Posted by John IS3 View Post
    Unless you change it via Tech2 or Vauxcom
    I asked my local Vx garage, and they told me there was no such setting. The 215 & 225 tyre size settings were the same.

  7. #7
    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 72K

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    Quote Originally Posted by Big Dave View Post
    I asked my local Vx garage, and they told me there was no such setting. The 215 & 225 tyre size settings were the same.
    Yep, wheel/tyre size speedo settings are organised in two groups:- Group1 and Group 2.

    215/50/17 and 225/45/17 are both in the same Group, as they have only a small difference in rolling diameter.

    When I changed my wheels over from 235/35/19 to 225/45/17, I changed the Speedo Rating Group.

    Given the fact that speedometers invariably over-read slightly, it may well be that 225/45/17 gives a more accurate speed reading than 215/50/17.
    Last edited by john_k_sri; 12th October 2012 at 13:47.

  8. #8
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    Quote Originally Posted by john_k_sri View Post
    Given the fact that speedometers invariably over-read slightly, it may well be that 225/45/17 gives a more accurate speed reading than 215/50/17.
    I found it's the other way around. Comparing the speed on the CD70 (when in settings menu) the 215's were closer matched to the GPS speed than the 225's.

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