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  1. #1
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    Default Wider Tires (better or not)

    I came across an article where different size tires were tested and looks like the overall winner is thinner tires with higher side walls ---Compare a 265/65/17 against a 245/70/17 then you will see that the 245 outperforms the wider tire in about 95% of all scenarios--A deflated 245`s footprint is longer as a 265`s foot print (sand) --If this is correct then why do most "off roaders" fit those massive wide tires ?
    The old landrovers are a perfect example of this
    What is the price difference ?
    Road noise ??
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  2. #2
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Mark Sanderson View Post
    I came across an article where different size tires were tested and looks like the overall winner is thinner tires with higher side walls ---Compare a 265/65/17 against a 245/70/17 then you will see that the 245 outperforms the wider tire in about 95% of all scenarios--A deflated 245`s footprint is longer as a 265`s foot print (sand) --If this is correct then why do most "off roaders" fit those massive wide tires ?
    The old landrovers are a perfect example of this
    What is the price difference ?
    Road noise ??
    I think in most cases this is totally true, however in many cases it comes down to price. I run 265/70 R17's but if i could find the same diameter in 245 I would do so. The problem is that a lot of the price is also about volume and looking for odd size tyres ends up being a lot more expensive.

  3. #3
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    Default Re: Wider Tires (better or not)

    Cos they look good and suck more fuel 🤣🤣🤣🤣
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  5. #4
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    Default Re: Wider Tires (better or not)

    interesting as I'm about to go from 215/80/15" to 265/75/16 on my camper van.

    im 'thinking' it's gonna be better in the rough....

    Lets listen to the clever guys.

    thanks,

    cc
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    Default Re: Wider Tires (better or not)

    I know my old LR books state the reason for the skinnies as being beneficial in mud, with a harder pressure, to cut through to firm ground underneath. But this will be dependent on the type of mud (I think there are 9 different types encountered in Europe)

    Sand types are also a factor.

    I know that thinner tyres with high sidewalls can have better advantages over rocks and in woody terrain which is counter intuitive, giving better traction and more wrap over rocks.

    Clearly, rolling resistance is a consideration

    Ultimately, it must boil down to the usual trade-offs and compromises and the reason I am happy with the Light Truck tyres on the H.
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  8. #6
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    Default Re: Wider Tires (better or not)

    You mentioned "old Land Rovers". I was under the impression that all Defenders use 235/80R16. I would have loved to fit those rather but my vehicle's front wheel arches doesn't allow it. I had to improve ground clearance and decided on the second popular size: 265/70R16, the size of 70 series LC wheels.
    Last edited by Spiceman; 2021/05/04 at 03:58 PM.
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  9. #7
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    Default Re: Wider Tires (better or not)

    i love narrow tires,and i agree with a test.
    it works in sand and shallow mud.

    now,
    my experience this weekend:
    imagine
    very narrow,rocky and steep incline with spice of axle twister.

    remember that following is not kama-sutra position

    bakkie sitting on rock sliders,2 front wheels free up in a air,
    left rear just touching wet rock,right rear free in a air.
    rear diff lock engaged but not helping.

    5mm to the right back wheel is big rough rock.
    if ,then and there,i just had 265 instead 245....

    conclusion what ever you choose it will be mistake.


    by the way next set of tires will be 235,i just love narrow tires.

  10. #8
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Mark Sanderson View Post
    I came across an article where different size tires were tested and looks like the overall winner is thinner tires with higher side walls ---Compare a 265/65/17 against a 245/70/17 then you will see that the 245 outperforms the wider tire in about 95% of all scenarios--A deflated 245`s footprint is longer as a 265`s foot print (sand) --If this is correct then why do most "off roaders" fit those massive wide tires ?
    Those 2 sizes have exactly the same amount of sidewall.
    Click image for larger version. 

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    So can be deflated to the same footprint length. I did well on 245's , but if you vehicle have enough torque to turn the 265 then you will do better with the 265 than with the 245.

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    Default Re: Wider Tires (better or not)

    Sorry, wrong picture , this one is correct
    Click image for larger version. 

Name:	Screenshot 2021-05-04 164040.png 
Views:	108 
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ID:	614449

  12. #10
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    Default Re: Wider Tires (better or not)

    Sometimes you want to float.
    Sometimes you want to displace the surface to find hardpack.

    Think F1 Dry slicks vs Wet treaded.

    And what about Game vehicles in Africa. Can't remember ever seeing a game vehicle with fat takkies at 0.8 bar. Seen lots of game vehicles with Marie Biscuit truck tyres.

    A lot depends whether you are playing or travelling.
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  14. #11
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    Default Re: Wider Tires (better or not)

    Narrower tyres, within reason have always performed better for me... But those cruiser crossply maries... nee
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  15. #12
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Hedgehog View Post
    Narrower tyres, within reason have always performed better for me... But those cruiser crossply maries... nee
    Yeh, they do look funny on a Rubicon, or a D4.

    Buuu..uut, think about the original Jeeps during WW2.
    Cheers

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  16. #13
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    Default Re: Wider Tires (better or not)

    Ok - from a towed perspective ??

    I 'feel' the bigger and wider give better float??

    thanks,
    Merit before Race - anything else IS Racism.
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  17. #14
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Capt Chaos View Post
    Ok - from a towed perspective ??

    I 'feel' the bigger and wider give better float??

    thanks,
    You would think.. but it increases drag..
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  19. #15
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    Default Re: Wider Tires (better or not)

    Is this a case of image over function?

  20. #16
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Capt Chaos View Post
    interesting as I'm about to go from 215/80/15" to 265/75/16 on my camper van.

    im 'thinking' it's gonna be better in the rough....

    Lets listen to the clever guys.

    thanks,

    cc
    You will find you have to budget more for fuel due to rolling resistance. The new size is 10% more in diameter.
    As per previous postings I also found that 215/65x16 more expensive than 235/60x16. The 16 inch tyres are not a popular size.

  21. #17
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by ekkekan View Post
    The 16 inch tyres are not a popular size.
    Not so long ago that was the only size!!!
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  23. #18
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    Default Re: Wider Tires (better or not)

    Another important point to consider. Most driving is by far on tar road for most people. Most of us have to drive a significant distance on tar road, and then gravel/dirt road, to get to off-road or similar conditions.

    The hazards of driving on tar road far exceed (imho) those off-road.

    I need tyres that are safe on highways, capable on gravel, and usable off-road with some sense applied.

    So, it's the wide tyres for me.

    Currently running 265/75/R15. Hopefully I've made the right decision.

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  25. #19
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    Default Re: Wider Tires (better or not)

    Seems like virtually nobody gets this, but the basic concept is very simple:

    The pressure in the tires is almost identical (within about 15%) to the pressure between the tire and the ground.
    Consequently, the pressure in the tire and the weight of the vehicle determine the contact area of the footprint (because pressure = force/area). This has NOTHING to do with tire size. Tire construction does however play a role (in determining the magnitude of the variance).

    What is affected by the tire size is the shape of that footprint (long and narrow or short and wide).

    Which one is better depends on the direction you are trying to accelerate and the type and shape of the ground underfoot.

    I have tried everything from 315mm wide (12.5") to 255mm wide, with the same nominal diameter on my vehicle. I can state with confidence that on softer rutted roads (anything from soft sand to sloppy mud), the narrower tires were better. I feel (but am not totally sure) that on expanses of relatively smooth rock (and tar roads), wider tires may have an advantage (but here compound hardness is far more important than tire size).

    However, the differences are probably smaller than most would expect.
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  27. #20
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    Default Re: Wider Tires (better or not)

    Quote Originally Posted by Spiceman View Post
    You mentioned "old Land Rovers". I was under the impression that all Defenders use 235/80R16. I would have loved to fit those rather but my vehicle's front wheel arches doesn't allow it. I had to improve ground clearance and decided on the second popular size: 265/70R16, the size of 70 series LC wheels.
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