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Thread: Tyre Question

  1. #1
    Regular Member Mads's Avatar
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    Default Tyre Question

    I'm after some 225/45/17 tyres, but am unsure about the 91y part on the tyre. I've been told i can use either

    91y
    94y
    91w
    94w

    What does this part mean? and can you mix them if need be, for example 91y on the front and 94w on the back?

    Thanks in advance

  2. #2
    Regular Member m8internet's Avatar
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    Default

    That is the load and speed rating
    The Vectra C requires are least :
    91 or higher
    H or higher, although VX recommend V or higher

    There are also tyres which are reinforced, also known as Extra Load or XL
    For the tyres you have mentioned the load rating will be 94 or 95
    Only the 3.0 V6 CDTI Auto Estate requires these, but it's also recommended for other 3.0 or higher engines

    You can mix speed and load ratings, but it's not recommended

  3. #3
    Regular Member Mads's Avatar
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    Default

    Thanks m8internet, i have just brought 2 continental sport 225/45/17 94w off Teza so i am after 2 more, I have seen some CS 225/45/17 91y would they be ok?

  4. #4
    Regular Member Gsi3.2's Avatar
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    Default

    'Y's will be fine for the vectra

  5. #5
    Regular Member Caterman's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 V6

    Year : 05

    Default

    Don't mix them on the same axle though

  6. #6
    Regular Member Mads's Avatar
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    Default

    no i wouldnt caterman, thanks.... if i did get y's would they be best on the front or back if i cant get any more w's?

  7. #7
    Regular Member m8internet's Avatar
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    Default

    The 91Y is a standard tyre, the 94W is a XL tyre
    I would suggest putting the 91Y on the front and the 94W on the rear
    The XL tyres cope much better with rapid deflation and catastrophic failure, so make the rear of the car slightly easier to control

    Also, if you had three 94W tyres and one 91Y tyre, then it doesn't actually make any difference where you put the standard tyre
    The only main difference is the tyre pressure as the XL tyres should be inflated to a higher tyre pressure, but if you fit different load and speed ratings across the axle then you should use the highest from the specifications

  8. #8
    Regular Member Gsi3.2's Avatar
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    Default

    Quote Originally Posted by m8internet View Post
    Also, if you had three 94W tyres and one 91Y tyre, then it doesn't actually make any difference where you put the standard tyre
    The only main difference is the tyre pressure as the XL tyres should be inflated to a higher tyre pressure, but if you fit different load and speed ratings across the axle then you should use the highest from the specifications
    if it came in for MOT it would Fail if you did that....

    the tyres on one axle MUST be the same size, speed rating,profile AND LOAD RATING..

    any mis-match on tyres is not allowed.. you can mix manufacturers but you HAVE to keep the 'numbers' the same..different ratings CAN be fitted in AXLE PAIRS but NEVER singly...

  9. #9
    Regular Member Mads's Avatar
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    Default

    thanks for the info mark

  10. #10
    Regular Member m8internet's Avatar
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    Default

    Quote Originally Posted by Gsi3.2 View Post
    if it came in for MOT it would Fail if you did that?
    the tyres on one axle MUST be the same size, speed rating,profile AND LOAD RATING..
    The MoT station can only issue the vehicle with an advisory for speed and load ratings mixed across axles, they cannot issue the vehicle with a failure
    The requirement is on type, size, and structure only
    Thus 225/45 being the type, 17 being the size, and radial being the structure
    Speed and load ratings only apply to MoT tests for Class VII vehicles

    My car was submitted last month with the Michelin test tyres, which are 94V and 91Y, and although it was mentioned the tester consulted his manual and came back that he could not even issue an advisory for that
    He also went away to see if they were on their system and they are not, although he found one that was quite close, then I explained they are part of a test by Michelin so I didn't expect them to be on their database
    Last edited by m8internet; 25th August 2008 at 21:31.

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