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Thread: XL or "standard" tyres?

  1. #1
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default XL or "standard" tyres?

    How do you know if your car uses XL or standard/normal load tyres?

    Let's take something like the 3.0 V6 CDTi (as it's got a heavyish engine)....

    You buy the car and it's got XL's on but you need to replace them - do you put XL's back on?

    or

    You buy the car and it's got normal load tyres on but you need to replace them - do you put standard load tyres back on?

    Where, if anywhere, does VX say you have to use XL or normal load tyres as the owners manual certainly doesn't mention it . If anybody says you "must" use XL tyres on the likes of the V6 CDTi or the GSi, I'd really like to know the reasoning behind it.


  2. #2
    Regular Member Ben50n's Avatar
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    You can use Ebay or places like ATS, pop in your reg number and it comes up with the recommended tryes for your car.

    You should then check the load rating stated.

  3. #3
    Full Member Big Sig's Avatar
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    If its an Auto get the xl's if its a manual you can get away with 91w's. The auto takes them over the load rating iirc. Although I always fitted xl's to my old 3.0cdti just to be on the safe side.
    Now I need a turbo to keep up!

  4. #4
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    Quote Originally Posted by Big Sig View Post
    If its an Auto get the xl's if its a manual you can get away with 91w's. The auto takes them over the load rating iirc. Although I always fitted xl's to my old 3.0cdti just to be on the safe side.
    So it's a case of if the car weighs XXXX kg that determines whether you go XL or not?

    A Blackcircles search for my motor throws up standard load tyres .
    Last edited by gtr1000; 30th January 2012 at 18:25.

  5. #5
    Full Member Big Sig's Avatar
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    Quote Originally Posted by gtr1000 View Post
    So it's a case of if the car weighs XXXX kg that determines whether you go XL or not?

    A Blackcircles search for my motor throws up standard load tyres .

    Its down to the axle weight divided by the number of tyres on that axle as all tyres have a load rating. So depending on weight (auto's are heavier) you may or may not need xl's. There was on member on here in the past who ran the wrong load rating on his 3.0 auto after the garage fitted the wrong ones and it blew the sidewall out.
    Now I need a turbo to keep up!

  6. #6
    Regular Member luke4487's Avatar
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    I looked online and no Vectras or Siggys needed XL tyres (although I didn't check auto's) so an Auto 3.0 Elite is the only car that MAY require them imo.

    I've never fitted them to my 2.8 V6 and not had any problems and I have been sat at speeds of 130mph with a fully loaded car at times on the autobahn (travelling to anf from the UK for Christmas with the family and dog so loads of stuff)...

    ...and touched 165mph on several occasions and my lump isn't much lighter than a 3.0

    I did some research a while ago as someone mentioned it about the tyres I was selling and XL's are more for MPV's where you could be carrying 7+ adults plus luggage. I would recommend them if you intend to transport Lead bricks around otherwise don't bother

  7. #7
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    Defo xl tyres mate had non xl on my old Vectra c 2.0dti and the tyre Walls kept blowing out 5 in 7 weeks put xl tyres on them and they was spot on
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  8. #8
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    VX claim a gross vehicle weight for the V6 CDTi Design of 2185kg, so dividing by four gives 546kg per tyre.

    From this table http://www.blackcircles.com/general/load-rating, I could in theory get away with a load index of 88 but 91's would be fine.

    I'm posing the question because I believe XL tyres give a much harsher and firmer ride at the expense of comfort and that the extra cost of XL tyres is not justified. Having said that, I've got Kumho KU39's (2 months old) with a 95 load index and thought that "you had to fit XL's on the V6".

    Big mistake on my part then as my previous GSi had Uniroyal Rainsports @ 91 load index and had a great ride.

  9. #9
    Regular Member Ben50n's Avatar
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    You cant actually divide the gross vehicle weight by 4, unless the car has an exact 50/50 weight distribution, that would also have to be factored in!

  10. #10
    Full Member Big Sig's Avatar
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    Quote Originally Posted by gtr1000 View Post
    VX claim a gross vehicle weight for the V6 CDTi Design of 2185kg, so dividing by four gives 546kg per tyre.

    From this table http://www.blackcircles.com/general/load-rating, I could in theory get away with a load index of 88 but 91's would be fine.

    I'm posing the question because I believe XL tyres give a much harsher and firmer ride at the expense of comfort and that the extra cost of XL tyres is not justified. Having said that, I've got Kumho KU39's (2 months old) with a 95 load index and thought that "you had to fit XL's on the V6".

    Big mistake on my part then as my previous GSi had Uniroyal Rainsports @ 91 load index and had a great ride.
    The problem with what you have stated is that you have perfect balance over all four wheels where is reality the front axle has a bigger load in normal use than the rear due to the engine position. On the data plate on the b pillar it gives the weight per axle. Your right though, 91w's would be fine.
    Now I need a turbo to keep up!

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