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Running different size tyres at the same time?

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  • Running different size tyres at the same time?

    I have just upgraded to a 2015 GX, from a 2004. I have a camper trailer that has aftermarket Prado rims, however came with 265/70R17. My current vehicle has good AT rubber, 265/65R17. On my old vehicle (part time 4wd) I was happy to that I could mix and match the spares if needed, as long as the rear had the same size, however now with the full time 4wd I am unsure if I could run say different sizes on the front with out doing some damage.
    Can some one shed some light on how the full time 4wd works and if i will do something like ‘wind up’ if in an emergency I had different diameter tyres?
    many thanks.

  • #2
    You still have a centre diff that will compensate for slight tyre differences. I don't know if the electronic crap will eventually throw a fit though. The wheel speed sensors will decide you have different wheel speeds front to back and may decide to apply brake to the faster ones ??? Perhaps you can turn it off like drivers do when in the sand.????

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    • #3
      I figure that off road it wont be a problem, uneven and loose surface will allow for slip. It’s more on the hard top, say the one side rotating slightly faster than the other, I know that would place some strain on a solid axle, but not sure about from to back, front left and right.

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      • #4
        probably ok to get you out of trouble on dirt but put the odd one on the front where there is a bit of difference due to steering

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        • #5
          Any LSD likes to have similar tyres so you'd try for equal tyres on the rear. Front diff has an open centre so it can accomodate different tyre sizes.
          If you intend using a camper spare or such on the car, I'd do a trial first as you may find the wheel's offset doesn't give clearance for the caliper.
          Likewise the Prado wheel may rub on the camper chassis rail, so it's best to do a test.

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