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Thread: Odd sized tyres and AWD

  1. 16th October 2016, 08:13 AM #1
    Carnut1100
    Carnut1100 is offline Master
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    Odd sized tyres and AWD

    On Friday morning one of my tyres blew the sidewall, so no hope of fixing it.
    I've got slightly larger than stock AT tyres on it, but the spare is a stock size Michelin with a milder tread.
    Not a huge difference in size but it's there.

    How big a deal is that, and do I need to get it replaced really soon?
    I've done about 20km on it to get home but need to do a bit of running around in the next few days.

    Secondly, for the longer term, will swapping in a new tyre be a problem if I don't replace the other 3 that are half worn?

    I've known people with cars using Haldex AWD have problems swapping one or two tyres and needing to replace them in full sets, just not sure how sensitive the rover system is...

    Disco 2.
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  2. 16th October 2016, 08:19 AM #2
    Tombie Guest
    It's never good and is loading up your centres constantly.

    It could also trigger TC depending on the size..

    Shouldn't be an issue with a replacement as I would suggest you put 2 new ones on same axle and keep the other old one as a spare.
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  3. 16th October 2016, 08:58 AM #3
    Carnut1100
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    Small difference front to rear is not a problem?
    Current tyres are approx half worn.
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  4. 16th October 2016, 08:59 AM #4
    Carnut1100
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    Not triggering traction control but I'd still rather have it sorted...
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  5. 16th October 2016, 09:24 AM #5
    Tombie Guest
    Small front to rear variation isn't a problem on a D2. Odd sized tyres and AWD
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  6. 16th October 2016, 03:06 PM #6
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    aussearcher
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    Carnut,
    The difference in rolling circumference between a brand new and half worn 33" is 2.7%, which is easily accommodated by the diffs. See my post "Max allowable difference in tyres" in here dated 14 August.
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  7. 25th October 2016, 06:17 PM #7
    superquag
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    It seems that the BW (Viscous Coupling) transfer case as used in the last few Classics and the P38 is sensitive to different size tyres - Front/Rear.

    The Classic tends to shred the (Output Shaft) splines...whilst the P38 chomps the chain & stuffs sprockets... being the same box in different weight & balance cars, implies that 'diffing' F/R is the Prime Suspect for the VC's inevitable demise.

    From embarrassing experience, having FOUR identical and 'newer' tyres is better than having different, old-but "good" brands on each end. Don't ask why... but never-again !
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