Can tyre types be mixed?





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  1. #1
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    Default Can tyre types be mixed?

    In an effort to prevent a huge outlaty on tyres for 4x4 trips that take place once or twice a year, what do you think about keeping my Dueler AT's on the front and buying mud terrains for the back?

  2. #2
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    depends on vehicle you drive
    full time 4x4 is no no for different tires
    Where as it should not be a problem with selectable 4x4 which is 2wd normally

  3. #3
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    It's a Fortuner 2011

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    Fortuner is selectable 4x4
    So should not be a issue
    just try and keep the sizes the same

  5. #5
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    CAN tyre types be mixed?- yes
    SHOULD tyre types be mixed?- a definite no
    * "Wat Spike probeer sÍ in sy min woorde" -Die Skim "
    .................................................. .....

  6. #6
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    Hi Spike. Why should they not be mixed?

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    Veneficus;Fortuner is selectable 4x4
    So should not be a issue
    just try and keep the sizes the same[/QUOTE]

    .
    Selectable as between locking centre diff and 60/40 split in 4H is this what you mean.

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    Quote Originally Posted by Veneficus
    Fortuner is selectable 4x4
    So should not be a issue
    just try and keep the sizes the same
    Not so. It's a permanent 4x4. And I agree with Spike.
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  9. #9
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    As long as the tyre height is the same you can mix without problems .

    Why are some people saying its a no no for permanent 4 wheel drive vehicles ? these vehicles have a unlocked centre diff so you will not get any diff wind up if the wheels are slightly different in height .

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    Quote Originally Posted by Shawn320v6 View Post

    Why are some people saying its a no no for permanent 4 wheel drive vehicles ? these vehicles have a unlocked centre diff so you will not get any diff wind up if the wheels are slightly different in height .
    Except that in a Tuna it is not a truly open centre diff, but an LSD.
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  11. #11
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    Different tyres have different grip characteristics, I am not sure whether it is wise to mix them.
    If you however do mix tyres on any 4x4 vehicle, make sure that the actual diameter / circumference is the same. Don't just go by what is written on the sidewall. You will find, that if you measure tyres of different brands & types, you will see differences is circumference, despite them having the same size printed on.
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  12. #12
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    Quote Originally Posted by Shawn320v6 View Post
    Why are some people saying its a no no for permanent 4 wheel drive vehicles ? these vehicles have a unlocked centre diff so you will not get any diff wind up if the wheels are slightly different in height .
    My question exactly.
    Even if you mix 265/70R16 with 245/70R16 the shaft rotation at 120 km/h will differ in the region of 120 rpm. On a normal diff the spiders should be quite happy with that? The worm gears in a Torsen may complain, but then is the hypoid gear happy at 3000 rpm.
    Handling should be affected less mixing tyres on a permanent 4x4 than on a 4x2.
    The Fortuner does not have a LSD, it has a Torsen diff. See last illustration at http://members.rennlist.org/951_racerx/PS84Gleason.html

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    Quote Originally Posted by BarOne View Post
    My question exactly.
    Even if you mix 265/70R16 with 245/70R16 the shaft rotation at 120 km/h will differ in the region of 120 rpm. On a normal diff the spiders should be quite happy with that? The worm gears in a Torsen may complain, but then is the hypoid gear happy at 3000 rpm.
    Handling should be affected less mixing tyres on a permanent 4x4 than on a 4x2.
    The Fortuner does not have a LSD, it has a Torsen diff. See last illustration at http://members.rennlist.org/951_racerx/PS84Gleason.html

    think about the traction control/stability control in new vehicles and how they rely on wheel speed sensors
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  14. #14
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    Agree with Spike.
    Can they be mixed; Yes, but only if no other option is available. ie stuck in the middle of nowhere.
    I wouldnt do it, even if for only one 4x4 trip a year.
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    Do not do it, I once had new tyres on the back and old, still enough tread in front,same tyre, in 4x4 on gravel the vehicle was all over the road because of different size.

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  16. #16
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    Quote Originally Posted by Piet van Heerde View Post
    Do not do it, I once had new tyres on the back and old, still enough tread in front,same tyre, in 4x4 on gravel the vehicle was all over the road because of different size.
    That makes sense; the wheels with the lesser traction were spinning constantly.
    I had two different brands on my 4x2 which worked as long as the brand with the lesser grip was fitted in front. With proper grip up front the tail was much too happy.
    My conclusion is that tyres may be mixed provided the front -and rear propshafts are not locked together, the vehicle is not fitted with ABS or stability- and traction control and you are not going to drive fast on a winding road. That leaves about no reason to do it.

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