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Thread: can i change my tyres

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    Default can i change my tyres

    Greetings all . i have a vectra 2.2 dti sxi and my tyres are 215.55 r16. on visiting my tyre depot they suggested 205.55.r16 as is stated in the vauxhall manual. is this tyre size right for my vehicle or should i keep with the size i have.
    many thanks

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    Regular Member m8internet's Avatar
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    Providing it is in the handbook, you can use either 205/55R16 or 215/55R16
    In the longer term 205/55R16 will be cheaper, but it won't make much difference
    Equally, you may end up with mixed tyres while you change from 215/55R16 to 205/55R16

    Personally, you are the customer, you asked for 215/55R16 and that is what they should supply

    Get a quote from blackcircles.com and compare if it is worth changing over

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    The DTi engine is quite heavy - I wouldn't be reducing my tyre size for the fronts if it were me - I don't have a manual to hand but it may be that the 205 tyres were only fitted to 1.8's as they're much lighter engines.

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    Size has nothing to do with the weight of the engine, thats why tyres have load ratings. However it is important to check these are correct
    Now I need a turbo to keep up!

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    Quote Originally Posted by Big Sig View Post
    Size has nothing to do with the weight of the engine, thats why tyres have load ratings. However it is important to check these are correct
    Yes and no - it's certainly the Load Index which is important - but "bigger" in the sense of just one dimension different with all others the same WILL give a higher Load Index assuming the construction is the same.

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    Quote Originally Posted by Ruperts Trooper View Post
    Yes and no - it's certainly the Load Index which is important - but "bigger" in the sense of just one dimension different with all others the same WILL give a higher Load Index assuming the construction is the same.
    A tyre with a load index of 91 thats a 215/50/17 can withstand the same loading as a 91 155/65/13. Unless thats what you meant?

    Or is this getting very complicated with the area of the foot print/load per area/friction arguement?
    Now I need a turbo to keep up!

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    Exactly, the load index depends on the total vehicle weight divided by five
    This allows for one tyre to fail and the vehicle to be safely brought to a stop

    I could fit 91H tyres to my car, but I wouldn't want to be doing more than 50mph when one tyre failed, never mind two!

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    Quote Originally Posted by Big Sig View Post
    A tyre with a load index of 91 thats a 215/50/17 can withstand the same loading as a 91 155/65/13. Unless thats what you meant?
    That's what I meant.

    205/55-16 are normally Load Index 91 while the 215/55-16 is normally Load Index 93.

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    Quote Originally Posted by Ruperts Trooper View Post
    That's what I meant.

    205/55-16 are normally Load Index 91 while the 215/55-16 is normally Load Index 93.
    Ahh got ya
    Now I need a turbo to keep up!

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    Default

    Can i change them? - yes you can.

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