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 doesn’t seem like a great idea and doesn’t 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

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Originally Posted by Turtle60

Tyre size and brand is a can of worms. I can only say what I run are 265 65 18 kO2’s and feel bullet proof in them. I’m guessing ( and I don’t do this) 275’s 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 265’s 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

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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 !

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Originally Posted by LRD414

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 doesn’t seem like a great idea and doesn’t 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

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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

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Originally Posted by Laurie 123

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

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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

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Originally Posted by LRD414

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

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Roger that !! Thanks

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

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Originally Posted by discomatt69

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

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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.

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Originally Posted by Turtle60

Tyre size and brand is a can of worms. I can only say what I run are 265 65 18 kO2’s and feel bullet proof in them. I’m guessing ( and I don’t do this) 275’s 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 265’s 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

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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.

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Originally Posted by Redback

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.

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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

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