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NCT & Tyre Wear

  • 19-06-2012 6:02pm
    #1
    vicwatson
    Registered Users, Registered Users 2 Posts: 28,404 ✭✭✭✭


    One of my tyres has wearing to the left of it though I measured the centre and the thread is above the 1.6mm legal limit, think it will pass? What I really want to know is will they fail it as it's to the left of the tyre vs if say it was in the centre of the tyre, or does it matter, will it still fail?

    Thanks in advance


Comments

  • #2
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    Reason for failure: Depth of less than 1 .6mm in the central three-quarters of the
    tread pattern.

    Obviously there's something causing your tyre to wear unevenly however, it may just be alignment but get it checked out. Having perfect tread in the centre of the tyre is no good if the edge wears down to nothing causing a blow out


  • #3
    vicwatson
    Registered Users, Registered Users 2 Posts: 28,404 ✭✭✭✭vicwatson


    challengemaster wrote: »
    Reason for failure: Depth of less than 1 .6mm in the central three-quarters of the
    tread pattern.

    Obviously there's something causing your tyre to wear unevenly however, it may just be alignment but get it checked out. Having perfect tread in the centre of the tyre is no good if the edge wears down to nothing causing a blow out


    So technically if the tyre is worn at the side as long as the central three quarters is above 1.6mm, can you define central three quarters, is it say to take a point from the centre of the tyre and go out either way 0.375 inches either side or??? sorry and thanks


  • #4
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    vicwatson wrote: »
    One of my tyres has wearing to the left of it though I measured the centre and the thread is above the 1.6mm legal limit, think it will pass? What I really want to know is will they fail it as it's to the left of the tyre vs if say it was in the centre of the tyre, or does it matter, will it still fail?

    Thanks in advance


    Regardless of the NCT and technicalities, is there not only one option if you know that any part of your tyre is bald?

    You will likely fail on wheel alignment too as this will be the cause of the uneven tyre wear.


  • #5
    vicwatson
    Registered Users, Registered Users 2 Posts: 28,404 ✭✭✭✭vicwatson


    Nissan doctor wrote: »
    Regardless of the NCT and technicalities, is there not only one option if you know that any part of your tyre is bald?

    You will likely fail on wheel alignment too as this will be the cause of the uneven tyre wear.


    Ok thanks, can you answer my question though?


  • #6
    vicwatson
    Registered Users, Registered Users 2 Posts: 28,404 ✭✭✭✭vicwatson


    Nissan doctor wrote: »
    Regardless of the NCT and technicalities, is there not only one option if you know that any part of your tyre is bald?

    You will likely fail on wheel alignment too as this will be the cause of the uneven tyre wear.


    Oh and I didn't say it was bald ;):)


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  • #7
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    vicwatson wrote: »
    Oh and I didn't say it was bald


    It must be below 1.6mm or you wouldn't have an issue, below 1.6mm is bald.


    The NCT manual says "that the central three-quarters of the tread pattern has a depth of at least 1.6 millimetres
    around the full circumference of the tyre"

    It also says "The tread pattern means the combination of plain surfaces and groves extending across the breadth of
    the tread" So if there is any smooth parts of the tyre then it will fail.


  • #8
    coylemj
    Registered Users, Registered Users 2 Posts: 25,650 ✭✭✭✭coylemj


    It means 75% of the tread as measured from the centre on each side so for example if the tyre was 8 inches wide, it means that there would have to be at least 1.6mm tread for three inches on the left and three inches on the right of the centre of the tyre.

    Or put another way, in that case (8" tread width), the outer one inch of tread on both sides of the tyre would be disregarded and everything inside it (i.e. the central 6" width) would need to have at least 1.6mm tread.
    Nissan doctor wrote: »
    It also says "The tread pattern means the combination of plain surfaces and groves extending across the breadth of
    the tread" So if there is any smooth parts of the tyre then it will fail.

    Don't agree, that is an explanatory sentence which does not describe pass/fail criteria.


  • #9
    CiniO
    Registered Users, Registered Users 2 Posts: 16,069 ✭✭✭✭CiniO


    vicwatson wrote: »
    So technically if the tyre is worn at the side as long as the central three quarters is above 1.6mm, can you define central three quarters, is it say to take a point from the centre of the tyre and go out either way 0.375 inches either side or??? sorry and thanks

    Central 3 quarters can't be really defined. It's just a description and it's hard to believe someone can not understand it.

    But I'll try anyway.
    Take tyre width and divide it into 8 equal pieces. Now look at 6 central pieces - that's central 3 quarters. Remining 2 pieces (one on each side) is what doesn't count as central 3 quarters.

    Example.
    Tyre width is 205mm. If you divide it by 8 you get 25.625mm. So 25.625mm on each side doesn't need to have minimum tread of 1.6, while central 153.75mm must be above 1.6mm.


  • #10
    vicwatson
    Registered Users, Registered Users 2 Posts: 28,404 ✭✭✭✭vicwatson


    CiniO wrote: »
    Central 3 quarters can't be really defined. It's just a description and it's hard to believe someone can not understand it.

    But I'll try anyway.
    Take tyre width and divide it into 8 equal pieces. Now look at 6 central pieces - that's central 3 quarters. Remining 2 pieces (one on each side) is what doesn't count as central 3 quarters.

    Example.
    Tyre width is 205mm. If you divide it by 8 you get 25.625mm. So 25.625mm on each side doesn't need to have minimum tread of 1.6, while central 153.75mm must be above 1.6mm.

    Thanks for indulging me, I'm a bit thick y'know:rolleyes:


  • #11
    jd6920s
    Users Awaiting Email Confirmation Posts: 76 ✭✭jd6920s


    I'd take your chance with booking it in :)

    Put the black spray on the sidewalls on tyre to make the tyre look fresh , it's worked for me :p


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  • #12
    MrFrisp
    Registered Users, Registered Users 2 Posts: 2,277 ✭✭✭MrFrisp


    1.6mm ..... Hmmmmm..

    I got my car tested a few weeks back,,and they have this at the bottom of the report..

    Tyre Thread less than 3.00mm
    Pass/Advisory


    Surprised they mentined it at 3.00mm......Is this just a reminder to keep an eye on it??





    .


  • #13
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    SexyGuy wrote: »
    1.6mm ..... Hmmmmm..

    I got my car tested a few weeks back,,and they have this at the bottom of the report..

    Tyre Thread less than 3.00mm
    Pass/Advisory


    Surprised they mentined it at 3.00mm......Is this just a reminder to keep an eye on it??

    Yes, as below 3mm the braking performance in the wet drops off significantly, aquaplaning is much more likely and performance in general is only 25% better than at the legal limit of 1.6mm.

    The way people rabbit on about "it's not a target it's a limit" about speed should be the way people think about tyres, as it's much more serious. You shouldn't leave your tyres until there's 1.6mm left before changing


  • #14
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    jd6920s wrote: »
    I'd take your chance with booking it in :)

    Put the black spray on the sidewalls on tyre to make the tyre look fresh , it's worked for me :p


    Yeah shiny sidewalls are great for making tyres safe again:rolleyes:
    SexyGuy wrote: »
    1.6mm ..... Hmmmmm..

    I got my car tested a few weeks back,,and they have this at the bottom of the report..

    Tyre Thread less than 3.00mm
    Pass/Advisory


    Surprised they mentined it at 3.00mm......Is this just a reminder to keep an eye on it??

    .


    3mm is the recognised minimum thread depth for tyre safety/performance, 1.6mm is the legal minimum.

    Ireland must be one of the only countries in the developed world where too many people think that the only point of decent tyres is passing a test.


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