Difference in tyre thread size?





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  1. #1
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    Post Difference in tyre thread size?

    I was wondering what would happen if for instance you have a puncture or blown out tyre and you replace it with a new tyre. If the old tyre was 6-7mm and the new was 12mm would it do any damage to your diff etc?? A guy from a local tyre shop told me that your tyres need to be more or less the same tyre thread in mm.. Is there a maximum that they can differ from each other and what damage could it cause running it like that?

  2. #2
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    Depends on what car, what mode it is in, what surface you are driving on, how long you will drive like that and which axle or diff it is on.
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  3. #3
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    It would possibly cause problems on a car with traction control and if you have difflock on a firm surface. Both those situations are only applicable if the 2 different size tyres are on the same diff and they're driven wheels.

    I'm not certain HT tyres have enough tread to create a big enough differential but a set of muds certainly could.
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  4. #4
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    all depends on the vehicle. permanent softroader 4x4s like BMW X3/5 the tyre size differenece results in the transfer case straining, this then breaks the adjustment motor inside the VTG. doenst happen straight away, but rather over a few thousand kms
    Currently do not own a 4x4, driving a sedan
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  5. #5
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    Its a 4x4 bakkie with lockable hubs in front, i have a rear diffloc but only ised it once in mud.. I see on a few oversee forums they say its a big NO.. So 30's in the front and 31's in the rear should be a big no then as well😔

  6. #6
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    Quote Originally Posted by Alton View Post
    It would possibly cause problems on a car with traction control and if you have difflock on a firm surface. Both those situations are only applicable if the 2 different size tyres are on the same diff and they're driven wheels.
    Agree, also some cars, noticeably VW AUDI products use individual wheel speeds as a tyre pressure monitor.
    Cheers

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    When our SWB was in an accident TuffStuff only replaced one tyre (Hankook MT). The others were 50%.. Been driving it like that for two years, hoping nothing breaks inside the diff
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  8. #8
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    Do a search, this is currently being discussed on another thread.
    David/Hillbilly - 1997 SFA Nissan Sani 2,7 TD - 5" lift on 33" tires - Dual Transfer with 4.1 gears

    http://www.youtube.com/user/davidabcab



  9. #9
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    I think it's all been covered here

    http://www.4x4community.co.za/forum/...d.php?t=191630
    David/Hillbilly - 1997 SFA Nissan Sani 2,7 TD - 5" lift on 33" tires - Dual Transfer with 4.1 gears

    http://www.youtube.com/user/davidabcab



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