Does Tyre Diameter make a Difference?





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  1. #1
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    Default Does Tyre Diameter make a Difference?

    The below findings were from a test done by Australian 4WD Action.
    Test vehicles: TD HiLux DC 2" lift and decked out for touring.

    1st Test to compare; 29" standard tyres against 31" tyres :

    Driven distance, 29" / 31" Tyres
    SAND: 13.7m / 25.4m
    MUD: 4.5m / 5.8m
    Rutted Hillclimb: 11.2m / 14.6m
    ROCKS: 1m / 4m

    Test 2, 31" vs 33" Tyres

    Driven distance, 31" / 33" Tyres
    SAND: 25.2m / 48.3m
    MUD: 5.8m / 7m
    Rutter Hillclimb: 14.6 / 15.3
    ROCKS: 4m / 4.5m
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  2. #2
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    Default Re: Does Tyre Diameter make a Difference?

    I'm not sure what the figures mean? Can you give an explanation?

    For example; -

    SAND: 13.7m / 25.4m
    MUD: 4.5m / 5.8m
    Rutted Hillclimb: 11.2m / 14.6m
    ROCKS: 1m / 4m

    The figures appear completely meaningless unless the context is provided?
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  3. #3
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    Default Re: Does Tyre Diameter make a Difference?

    http://www.4wdaction.com.au/ultimate...size-shootout/

    here is a very good test they did on tyre size.
    Bigger tyres have there pro's and cons

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  5. #4
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    Default Re: Does Tyre Diameter make a Difference?

    Thanks for that article, was a very interesting read....
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    Default Re: Does Tyre Diameter make a Difference?

    Very interesting read, thanks for posting! I think the old analogy holds true, a vehicle is always a compromise and the more you mod it to suit on purpose the worse it performs on the rest of the purposes. Big tires are good for off roading but not so good for fuel consumption, handling and braking.

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    Default Re: Does Tyre Diameter make a Difference?

    Quote Originally Posted by Olyfboer View Post
    I'm not sure what the figures mean? Can you give an explanation?

    For example; -

    SAND: 13.7m / 25.4m
    MUD: 4.5m / 5.8m
    Rutted Hillclimb: 11.2m / 14.6m
    ROCKS: 1m / 4m

    The figures appear completely meaningless unless the context is provided?
    Distance traveled in Sand with 29" tyres was 13.7 meter before it got stuck.
    Same stretch of sand driven with 31" tyres, took 25.4 meter before it got stuck.
    Therefore larger diameter wheels/tyres was an improvement of 11.7 meter in sand
    And so it goes for the rest of the comparison and also for the 31" tyres vs the 33" tyres.
    With some obstacles there is a lesser gain with larger diameter than other...
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  8. #7
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    Default Re: Does Tyre Diameter make a Difference?

    Sometimes the problem with many of these tests are more variable are added than just say diameter. The tests I quoted did not specify the increase or decrease of width, it only says the diameter size.
    The link posted by Ocin; the 3 tyre sizes used were higher and wider, making for a lot of change form one size to another.
    The other variable is inflation pressures. When you use the same pressure between all the sizes, it might not be the better pressure for that tyre/vehicle combination...

    Since tests like these cost money and lots of time, you very seldom see them done in SA. Maybe if everyone on the 4x4 Community throws in R10 we can do our own tests.....
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    Default Re: Does Tyre Diameter make a Difference?

    I don't know why they do these tests when everyone knows what the results will be. The 4x4 fraternity is not stupid.

  10. #9
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    Default Re: Does Tyre Diameter make a Difference?

    Chris, I agree with you up to a point. There are many myths out there, and many people follow them blindly, even by some more seasoned 4x4'ers. Some are true, others not so true.
    I find tests interesting, but only when done "correctly", otherwise it might add to an existing myth.

    I was part of a group that did a test to see what loads are involved during a snatch recovery. It was interesting to see the mixed reactions; some thought it was as expected, others thought it would have been higher, giving the circumstances, including the seasoned 4x4 fraternity....
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    Default Re: Does Tyre Diameter make a Difference?

    Kiri, that snatch recovery loads will me be most interesting! It is also of the utmost importance to have an idea what those figures are. We do snatch recoveries without realizing what happens really.

  12. #11
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    Default Re: Does Tyre Diameter make a Difference?

    Quote Originally Posted by Chris Stoffel View Post
    Kiri, that snatch recovery loads will me be most interesting! It is also of the utmost importance to have an idea what those figures are. We do snatch recoveries without realizing what happens really.
    Chris, I'll start a new thread under Recovery....
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