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Thread: Biggest legal tire size for a disco 4

  1. #11
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    Biggest legal tire size for a disco 4

    Johnson Rods are an American product so not the best source for info on Aus rules. It would be worth understanding what is legal in your state. Having your spare on the roof all the time doesnít seem like a great idea and doesnít leave much capacity for carrying anything else. You should also research the wheel arch and possibly chassis mods required if running the 275/65, plenty of info on that in here if you search.

    I have been using 265/60 KO2s for awhile now and find this size offers decent extra diameter and sidewall height without any rubbing or difficulties with the spare, as well as a good selection of tyres.

    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels, Traxide DBS, Rhino Platform, APT sliders & protection plates, Prospeed Winch Mount with Carbon Winch, Mitch Hitch & Drifta Drawers
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  2. #12
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    Quote Originally Posted by Turtle60 View Post
    Tyre size and brand is a can of worms. I can only say what I run are 265 65 18 kO2ís and feel bullet proof in them. Iím guessing ( and I donít do this) 275ís may be an advantage for mud rrunning hill climb events. For everyday day touring / dirt roads I believe all round it is overkill and a pain in the proverbial and actually illegal. But yes my 265ís are stored deflated underneath and there may occasionally rub but rarely. 265 60 18 wont do any of the above but are hardly bigger than standard. Cheers

    Thanks Turtle! yep the ones i have are probably ok But ruts are a bit of a prob thats why im instaling JR's In saying that i might try what you recommend and are running on your rig .Thanks mate !

  3. #13
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    Quote Originally Posted by LRD414 View Post
    Johnson Rods are an American product so not the best source for info on Aus rules. It would be worth understanding what is legal in your state. Having your spare on the roof all the time doesnít seem like a great idea and doesnít leave much capacity for carrying anything else. You should also research the wheel arch and possibly chassis mods required if running the 275/65, plenty of info on that in here if you search.

    I have been using 265/60 KO2s for awhile now and find this size offers decent extra diameter and sidewall height without any rubbing or difficulties with the spare, as well as a good selection of tyres.

    Scott

    Yep the tires you are using 265/60 ko2's are the same as Turtle60 uses so i will definately have a crack at them seems most of the blokes are using that size with great results Thanks mate

  4. #14
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    Quote Originally Posted by Laurie 123 View Post
    Yep the tires you are using 265/60 ko2's are the same as Turtle60 uses so i will definately have a crack at them seems most of the blokes are using that size with great results Thanks mate
    He stated 265/65 and mine are 265/60. Both are quite popular for the D4 but the 265/60 meets the original OP query; legal and zero rubbing.

    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels, Traxide DBS, Rhino Platform, APT sliders & protection plates, Prospeed Winch Mount with Carbon Winch, Mitch Hitch & Drifta Drawers
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  5. #15
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    Quote Originally Posted by LRD414 View Post
    He stated 265/65 and mine are 265/60. Both are quite popular for the D4 but the 265/60 meets the original OP query; legal and zero rubbing.

    Scott

    Roger that !! Thanks

  6. #16
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    I have a rear wheel carrier so the size isn't a issue for storage, from my experience wider is not better but the taller the better,hence the reason I went 265/65 not 265/60. Both sizes have pros and cons, both are readily available and easy to get

  7. #17
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    Quote Originally Posted by discomatt69 View Post
    I have a rear wheel carrier so the size isn't a issue for storage, from my experience wider is not better but the taller the better,hence the reason I went 265/65 not 265/60. Both sizes have pros and cons, both are readily available and easy to get
    While this maybe the case in the city of even rural NSW VIC, the NT is very different, rural areas up there still haven't quite got a grip on 17",18" and especially 19" tyres in certain sizes and it can take time to get them in if you happen to get a flat need a new one.

    So if you want to put larger tyres on a D4 don't pick an obscure size, go with a common size even if it means it's not larger for remote travel.

    Just out of interest Laurie123, is your D4 a 2.7l, if it is go with 17s if you can.
    2011 Discovery 4 SE 2.7L
    2007 VW Golf Mk V TDi
    1973 Kawasaki H2-A 750
    2006 BMW R1200GS
    1981 Honda CB900F

    A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

  8. #18
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    Quote Originally Posted by Turtle60 View Post
    Tyre size and brand is a can of worms. I can only say what I run are 265 65 18 kO2ís and feel bullet proof in them. Iím guessing ( and I donít do this) 275ís may be an advantage for mud rrunning hill climb events. For everyday day touring / dirt roads I believe all round it is overkill and a pain in the proverbial and actually illegal. But yes my 265ís are stored deflated underneath and there may occasionally rub but rarely. 265 60 18 wont do any of the above but are hardly bigger than standard. Cheers
    The interesting thing about the 265/65/18 is that they cost the same as the same BFG kO2 265/60/18. There is more cost in the 65 sidewall versus the 60's sideway because the 65 is taller, but they cost much the same - my quote is less than $2.00 difference.

    Curiously with the BFG tyres, their 265/65/18 is not really IMO a 65 tyre - because its diameter is 801mm (legal as Wrangler that ships with D4s are 255/19/55s with a diameter of 763, hence add 50mm you get 813mm max legal in most states I think. The BFG 275/65/18 is 815mm Diameter whence marginally illegal IMO. Note too the ratings go from the standard tyre of 240KMH, to much lower with the kO2 BFG - the 65 profile is not much over 160 KMH.

    Some figures for the Standard tyre on the D4 2014, and from BFG's KOs tech sheets:

    original Discovery Tyres


    763 OD


    WRANGLER HP ALL WEATHER
    SUV Highway


    So add 50 to 763: 813 OD Maximum;


    Original Wranger Goodyear Discovery Tyres

    Front Size
    SKU 542929
    Application SUV Highway
    Section Width 255
    Aspect Ratio 55
    Rim 19
    Construction SUV HIGHWAY
    Load Index 111 { represents load carrying capacity: 1090 kg }
    Speed Rating V { represents max speed capability: 240 km/h }
    Side Wall Lettering BLT
    Nominal Od 763
    Radial Diagonal R
    Ply Rating XL
    Tube Type TL

    BF Goodrich KO2 tyres:


    ]275/65R18 123R


    Display Rim
    18
    Overall Diameter
    815 - therefore 2mm too large
    Width
    275
    Aspect Ratio
    65
    Rim Size
    18
    Load Index
    123
    Speed Index
    R


    Display Rim
    18
    Overall Diameter
    801 - Therefor quite legal
    Width
    265
    Aspect Ratio
    65
    Rim Size
    18
    Load Index
    122
    Speed Index
    R


    265/60R18 119S


    Display Rim
    18
    Overall Diameter
    775
    Width
    265
    Aspect Ratio
    60
    Rim Size
    18
    Load Index
    119
    Speed Index
    S


    I would have to deflate the under car tyre too if its 65 profile including for the 265/675/18 as well I think. And I need to ensure too that my about to be fitted bullbar from ARB will not hit 265/65/18s. I think wider than 265 would hit I have read ... on my still under warranty 2014 "Discovery" on the bonnet series D4 HSE.

    The problem is that laso the 275 is not quite legal in Victoria in theory. So no insurance I guess. Not sure about warranty issues either. One would have to clear some issues or put in Llam or similar to not have clearance issues too.

    By the way Green Oval who invented the Compomotive 18" tyre have a spreadsheet with all the tyres that fit without rubbing, some that rub a bit and some that rub more, and what to do about it. Worth downloading the spreadsheet IMO.

  9. #19
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    melbourne
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    Quote Originally Posted by Redback View Post
    While this maybe the case in the city of even rural NSW VIC, the NT is very different, rural areas up there still haven't quite got a grip on 17",18" and especially 19" tyres in certain sizes and it can take time to get them in if you happen to get a flat need a new one.

    So if you want to put larger tyres on a D4 don't pick an obscure size, go with a common size even if it means it's not larger for remote travel.

    Just out of interest Laurie123, is your D4 a 2.7l, if it is go with 17s if you can.
    Thats why I always carry 2 spares when going really remote, touch wood I have never needed 1 spare and the plug kit is also always close at hand.
    Before our Kimberly trip last year that took us right across the top end I rang a few places before we left and they all said the bigger tires are becomming more common and are available if not that day with 2 days as now Prado and 200's run 18's

  10. #20
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    The 265/60/18 is the OEM size for some Prado and Pajero models,and quite a few utes.
    paul

    D4 MY12 white,2.7(with a few more killer wasps) rear air,e diff,xenons,arb bar,7 seat ,18" bfg KO2

    Puma Defender 110 (son's)ARB
    bar,snorkle,rocksliders,rack,KM3's,BAS chip

    '56 S1,been in the family since...'56

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