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Thread: Tyre size change question...

  1. #1
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    Default Tyre size change question...

    Hi Chaps,

    I have a 1.8 Sxi RoadBurner (!!), which is currently on the WORST tyres in the world (I inherited them)...

    Despite the fact that they still have loads of tread left, I am changing them before they f$%king kill me!!

    My question is this - its currently on 215/55 16 tyres, but could (and should) I get the same size or should I look at 225/45 16 tyres (or even 225/50 16)??

    Cheers in advance, chaps.

    Simon.

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    Regular Member parapaul's Avatar
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    Stick with 215/55/16 - that's the size Vauxhall list in the handbook.

    Tyre grip is only determined by 2 things - the weight of the car and the friction of the tyre. That's physics, it's not open for discussion

    Stick to the same size but get decent tyres. It'll make a world of difference.

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    Cheers Paul.

    You said what I was already thinking anyway...

    I started a thread about comedy tyre names a few weeks ago because of these rubbish tyres...

    Even though I know they are crap, and drive like a granny because of that - the ba$(ards STILL let go at almost every bend and roundabout in the wet...


    People REALLY shouldnt be allowed to make tyres that are this bad...

  4. #4
    Regular Member Hideous's Avatar
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    215/55/16 = 118.25 mm tyre wall
    225/50/16 = 112.50 mm tyre wall


    So, 12 mm smaller overall tyre+wheel with 225/50/16.
    A lot of other people on this forum have changed 215/50/17 to 225/45/17 (same 1/2 inch difference overall, as what you are thinking of doing with the 16s). Apparently, it's an acceptable difference, but I wouldn't be happy to do this.

    I'm on 16s too, & I would stick to the advice of keeping with the original tyre size.

  5. #5
    Regular Member parapaul's Avatar
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    Quote Originally Posted by abbeytec View Post
    I started a thread about comedy tyre names a few weeks ago because of these rubbish tyres...

    People REALLY shouldnt be allowed to make tyres that are this bad...
    I remember... Wanli and Linglong or something?

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    Regular Member m8internet's Avatar
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    The worst tyres are normally determined by their stopping distance in the wet

    Even major brands are known to be scary in the wet
    http://www.tyrereviews.co.uk/Grid/
    Just look at the ratings all the Pirelli tyres are given!

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    Quote Originally Posted by parapaul View Post
    I remember... Wanli and Linglong or something?

    Ha, ha, You remember correctly... Ling Long, FFS.....

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    Full Member Big Sig's Avatar
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    Quote Originally Posted by m8internet View Post
    The worst tyres are normally determined by their stopping distance in the wet

    Even major brands are known to be scary in the wet
    http://www.tyrereviews.co.uk/Grid/
    Just look at the ratings all the Pirelli tyres are given!
    Thats a good site, I feel sorry for the Yoko AVS sport owners in the wet

    I am also well pleased my current tyre of choice is top of the table
    Now I need a turbo to keep up!

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    Regular Member boba's Avatar
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    Quote Originally Posted by parapaul View Post
    Tyre grip is only determined by 2 things - the weight of the car and the friction of the tyre. That's physics, it's not open for discussion
    Well I don't know where you did your physics degree but if I were you I would claim a refund .

    If it was as simple as that all of the F1 teams would use a nice thin tyre and save lots of moolah.

    <anorak>
    Firstly the weight - the cornering (centripetal) forces and the downward (stiction) forces are both proportional to the car's weight so from a weight point of view alone the same tyre will give the same grip with any weight of car (it doesn't though!).

    While friction is important it isn't the only thing that counts. If it was all that mattered it wouldn't be possible to brake or corner at more than 1G (F1s can manage to brake at up to 1.2G or more and corner at over 1.5G (more with good aerodynamics). Tread patterns are for more than just clearing water and even the best roads aren't exactly smooth!.

    HOWEVER on wet roads it is important to have enough downward force on the tyres to prevent aquaplaning and this is where smaller sections win (as well as good tread patterns). And on snow you need enough downward force to bite and not sledge.

    </anorak>

    FWIW I changed the tyres on my last car (BMW 5-series) from 225s to 245/265 and it made a huge difference to dry handling but much poorer in the wet where aquaplaning started at considerably lower speeds.

  10. #10
    Regular Member deanos's Avatar
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    I got some 215/55/16 tyres for mine last week, Avon ZV5 very good, nice and quiet and very grippy, £140 for the pair fully fitted,ive got some Avon ZZ3 on the back and they are just as good

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