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Thread: How much variation in tyre size is ok?

  1. #1
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    Aug 2009
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    How much variation in tyre size is ok?

    Hi Guys,

    I am running 245/70/16 dueller 697s on the D2 which are around 50% worn. I also have 2 brand new mounted spares.

    I have always kept to matched sets of 4, however; am about to head off on a trip in a couple of weeks and was thinking of putting the fresh tyres on front axle as they will be a bit smoother on bitumen.

    Question is, can I get away with this or am I asking for trouble?

    Cheers, Charles

  2. #2
    Join Date
    Feb 2014
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    Diamond Creek Victoria
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    Quote Originally Posted by Charles View Post
    Hi Guys,

    I am running 245/70/16 dueller 697s on the D2 which are around 50% worn. I also have 2 brand new mounted spares.

    I have always kept to matched sets of 4, however; am about to head off on a trip in a couple of weeks and was thinking of putting the fresh tyres on front axle as they will be a bit smoother on bitumen.

    Question is, can I get away with this or am I asking for trouble?

    Cheers, Charles
    I've done it before on several different vehicles. As long as you keep them to the same axle, there should be no worries.

  3. #3
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    Cheers AllTerr

  4. #4
    trout1105's Avatar
    trout1105 is offline YarnMaster Silver Subscriber
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    If all your tyres are 50% worn I would strongly suggest that you replace them all if you are heading off on a trip, The last thing you need on a trip is tyre problems.
    Older half worn tyres are OK for Town work But as they have usually also suffered some bruising/damage to their sidewalls as well as tread wear during their life on the truck they are susceptible to failure on extended trips.
    I don't think that the small difference in the size of the new tyres will hurt the truck too much But why risk a blowout by not replacing the rear tyres as well.
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
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  5. #5
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    Also a very good point Trout...

  6. #6
    Join Date
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    Bracken Ridge - Brisbane - QLD
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    I like to keep four tyre with this same wear rate

    If it was me Id buy two new tyres, fresh ones on the front, two spares that are new on the rear and the best two 50%ers as spares.

    2000 110 Hardtop

  7. #7
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    I agree with weeds 👍

  8. #8
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    Apr 2009
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    Crafers West South Australia
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    The rolling diameter of a tyre varies very little with tread wear. It's the length of the steel belts under the tread that determines the revs/km. Differences in tyre condition may affect your handling if you get into a sticky situation but that's another issue.

  9. #9
    Join Date
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    The tyre wear is negligible. Heck I run different diff ratios front and back, has not been an issue at all. (3.5 & 3.54)
    Damien
    ------------------------------------------------

  10. #10
    Join Date
    Aug 2009
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    Thanks guys - I think I will take the no worry option and add 2 new tyres to make a full set.
    Cheers and thanks for input.
    Charles

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