oversize tyres for the disco

[2_door]

has anyone got 235/85/16 or 33/10.5/15 tyres on their disco... would like some info if I can :angel:

[trobbo]

run up to 35's on mine - what did you want to know?

[2_door]

thanks for the reply

what width rims and what offset are they

what size suspension lift and/or body lift do you need to get clearance

how much clearance do you have under the diffs

did you have to cut the front guards for clearance

did you have to fit flares to cover the tyres

just a few things :angel: thanks

[Chucaro]

Come and see my new Maxxis 235x85x16 in my Rangie and see if you can fit the spare. They are just bellow 32". the ones in your disco are 31"
They cost me $ 195.00 ea
Cheers

[discopete]

G'day Mark,
I tried 235/85/16s on my disco but found they rubbed too much at the rear, thats with about 2.5 inch lift included spring spaces which would act a bit like extended bump stops. The front was ok because the springs are too stiff, with the springs I want in there it would be a problem. I think with a 2 inch BL they will work ok. You do notice the gearing with these tyres as opposed to the 245/75s.

Cheers,
Pete

[DaveS3]

I chucked some 235x85x16s on offset rims on my disco with no problems.
Car has ~40mm springs and 50mm body lift.

You need to run offset rims.

I have also not touched to trimmed anything with this set up, no rubbing at all.

Dave

[2_door]

how far offset are those rims Dave

[DaveS3]

No idea, but a fair bit - they are basically reversed series rims.

The rears are offset about 10mm more than the fronts

I'll try and measure sometime in the daylight this week.
Dave.

[Cap]

Hey Shorty, from what I understand (and I could be wrong!) LRA sell Sunny style rims with a 1" offset for $99 ea... but I have read somewhere were people have made offsets of 80mm+, but these are for 12.5 wide rubber.

So mate, are you trying to tell me something here??? hehehe

[LandyAndy]

Mines D2,yep no probs,overgeared a bit!!!,The D2 has better wheelarch clearance than a D1.
See Agrojnrs pics in "show us your Discovery" He has them on a D1.
Andrew

[PeterM]

Ok, ser 1 disco with 235/85 R16s fitted.

You can run them with a suspension kit BUT you will need to trim the rear guards, otherwise the tyre will catch them. There is no need to run offset rims with this size tyre. There is no need to run flares but it would be neater with them after you trim the guards.

I have a 25mm body lift in preparation for fitting taller play rubber on a second set of rims. Bit more work involved if you go larger than 32s.

[mickashay]

i run 32inch muddies 235x85x16 on 16x7 rims and recomend at least 2inch lift or more.i had to trim rear quaters as i smashed them on the tyres a few times now theres no rubbing at all

[2_door]

thanks guys, i have had to trim my rear guards anyway for the 245/75's so thats not an issue.

I am interested in how much more clearance I will get under the diff centres, could someone measure the clearance they have there so I can compare it to mine at the moment.

thanks in advance :D:D

[kingyrules]

Hi guys thought I would weigh in on this. I’ve got Goodyear wrangler/AT 225/75/16, they are ok for light soft and dry stuff, but I want to put something else on, that is a bit more all purpose eg mud,

I don’t do many k’s on road and don’t want to fit offset rims, this just doesn’t make good sense to me (2 different rims to deal with a flat).

Having not long ago bought the TDi, it seems a bit higher than the V8 disco1 I had, and at the lights it seems higher than most discos. But I just can’t convince myself its not disco owner superiority:cool:. How much space should I have between the front and rear wheel and guards if I had no lift (cant ask the 4x4 place don’t want to look stupid:confused:. I can tell the lr springs aren’t stock and the shocks are nitro).

So what type of all round eg off road tyre that’s not cheap but cost effective would you guys recommend.

David

[mickashay]

just gave mine a measure and it was about 245cm aboutjust under 10inches
what is it with your tyres now

[kingyrules]

just gave mine a measure and it was about 245cm aboutjust under 10inches
what is it with your tyres now




ok from where i think you measured mine is about 18cm or 7 inches, remembering that i've got 225/75/16 larger than most i've seen that are ???/70/16, not much diff i know.
see pic

https://www.aulro.com/afvb/images/imported/2008/04/610.jpg

ps thats not rust its just dirty, also the tyres are crap note the bump on the wall, thats just another reason i want to upgrade.

[mickashay]

ok from where i think you measured mine is about 18cm or 7 inches, remembering that i've got 225/75/16 larger than most i've seen that are ???/70/16, not much diff i know.
see pic

https://www.aulro.com/afvb/images/imported/2008/04/610.jpg

ps thats not rust its just dirty, also the tyres are crap note the bump on the wall, thats just another reason i want to upgrade.

i measured mine from diff center to ground

[2_door]

thanks Mick, you got it. I was after the measurement from the ground to the bottom of the diff centre. Its not much use measuring the gap between the wheel and mudguard as there are too many variables that will change that measurement. Mine is parked half on the gutter and half on the road, I will have to move it onto flat ground tomorow and measure it accurately :D

I am looking at improving my ground clearance which is why I am chasing the measurement from the ground to the bottom of the diff centre as that is generally the lowest point on the 4wd that will get caught on ruts, mud and rocks :o

[953]

just gave mine a measure and it was about 245cm aboutjust under 10inches
what is it with your tyres now

Next time u deflate , measure again, u might be shocked by what u loose:o.
Its a fine line between clearance & traction, there`s a few different schools of thought on this;).
Cheers Dean.

[mickashay]

yep will do.. its my main way of getting stuck in the bush by diff drag in the big ruts of the larger tyres..im going 33's or 35's to fix this

[kingyrules]

i was looking for the body height flat ground, not the ground clearance from the diff, i know that this is just a guide but i wasn't overly concerned with ground clearance. If you don't have the room on top of the wheel you wont get it under it either. and not knowing what was the normal body height was my question.

Also whats involved with fitting bigger tires? obviously the guards body lift etc, is there any school of thought about how these bigger tires impact on the diffs etc, is an upgrade of the shafts and centres necessary or just showing off?

[mickashay]

not sure my heights between guard and tyre i run a pretty aggressive tyre here is a photo of mine sitting fairly flat and flexed with the wheel up in the gaurd just touching 7813

7814

[kingyrules]

yeah i think i'm going to have to think up another way of telling if mines lifted and if so how much. i hate the fact i bought it from a dealer they don't know squat about what the last bloke did and don't care as long as they get the cash. i might have to go and look dumb and ask 4x4 guy that fixes my boo boo's.:D

[dirtdawg]

how big can you go tyre wise on a d1 with stock diffs?

[mickashay]

how big can you go tyre wise on a d1 with stock diffs?

as far as i know mine r stock diffs and i give mine a pretty hard time as you saw the other day.. 33 would probly be allrite for a while depending how hard u drive any bigger u start to need upgrades

[mickashay]

yeah i think i'm going to have to think up another way of telling if mines lifted and if so how much. i hate the fact i bought it from a dealer they don't know squat about what the last bloke did and don't care as long as they get the cash. i might have to go and look dumb and ask 4x4 guy that fixes my boo boo's.:D

try your manaul it mite tell you the ride height from ground to guard above wheel..pedders i think have a book that tells them standed heights for most cars

[sschmez]

how big can you go tyre wise on a d1 with stock diffs?

My 245/75/16 cooper st's did this to my guard on artic. (sagged 2" susp lift, no body lift)

https://www.aulro.com/afvb/images/imported/2008/12/17.jpg (http://www.aulro.com/app/showphoto.php/photo/1777)

https://www.aulro.com/afvb/images/imported/2008/12/18.jpg (http://www.aulro.com/app/showphoto.php/photo/1778)

Cut the guards = No further probs

Stevo

[PeterM]

There's a lot of variables involved that affect the driveline, tyres only being one of them. Now the larger tyres have an effect in increased loads to get the vehicle moving due to the weight and larger rolling diameter.

Shock loading is what kills drivelines, a madly spinning wheel suddenly finding traction, stomping the loud pedal when in a low gear etc. That said, LR engineered the driveline with a couple of weak spots. The axles are generally considered to be weakest point. You can upgrade the axles with items such as Maxi-Drive units and not worry about breaking them...ever.

If you're putting in the axles you then ask yourself, 'What about doing diff-locks at the same time, do I do one or both?' This also addresses another point, the diff carrier. Stock ones are lightweight in comparison to the ones in locker kits.

Then with all that, if you're going bigger than say 32s you should start thinking about gearing changes and how you want to achieve that be that through diff centres or transfer case gears.

Many options and ways to skin this kitty.

[kingyrules]

HUMMM. this all sounds a bit rich for my blood ATM.
i might have to wait till that big lotto win:(

[PeterM]

Just one thing at a time mate. It's just that you need to know where you want to head, ideally. That way you can save up and get a whole lot of work done at the same time in the same area. For example, if you want to go 35s you'd save to get axles, diff locks and gearing (if doing CW&P) at the swame time.

[kingyrules]

yeah thats a good point. I just hope the disco 1 isn't a classic vintage by then:D

[kingyrules]

just a quick question, when they say 33' 35' etc how is that measured, is it diameter, hight, tyre wall or none of the above:)?

[DaveS3]

Tyre height in inches.

[streaky]

I have 265/75-16's on my series I Disco combined with Dobinson 2' lifted springs.
I've replaced the front radius arms with 3 degree cranked ones and left the rear standard. I've trimed all four arches and fitted extensions to them.

Now here's here my contension sets in. The Transfer box and gear box started to makes nasty noises on the over-run at 70mph. The work shop who fitted the gearbox and transfer box are saying that the lift and slightly over size tyres are the reason for the premature wear in the gearbox.
Now I think they are talking out of their backside and just don't want to replace the faulty tranny.
Has anyone ever had issues with the gearbox and transfer case because of slighty oversozed tyres and a 2" lift?
We all know that UJ's and propshafts can be subject to vibrations and premature wear...but the tranny also??

I'd be surprised if any one has.

Comments please?

Thanks guys.

[kingyrules]

is your Tran auto or manual?, I've got a similar tyre size same radius 225/75/16 with no probs not as wide but still, and still got the original gear box (mines manual don't know if that will make a diff), my advice get a second opinion, just don't tell em that its new box etc, just tell them about your tyre and lift upgrades, see what they say. either way you will find out whos honest.

[2_door]

sorry to interupt your gearbox issue.

[2_door]

just gave mine a measure and it was about 245cm aboutjust under 10inches
what is it with your tyres now

errr, 225mm front and 235mm rear


geez man if you got 245cm, I would be able to stand under that, just :angel:;)

[kingyrules]

errr, 225mm front and 235mm rear


geez man if you got 245cm, I would be able to stand under that, just :angel:;)



LOL:lol2: i did see that when it was written, it that height i could just about drive the falcon under, i'm mean gee's man what is it a monster truck.:D:D:D;)

[2_door]

here is a pic of my s1 disco with 255/85/16's on the front. I normally run 245/75/16's but when I saw these on it, I was astonished to see what a difference there is in size to the 255/85's.

It is on a RR rim so dont worry about the offset or anything, I was just interested to see what it is like for guard clearance. Keep in mind that the vehicle has a 2 inch suspension lift as well. There is no way I would be taking it bush without a decent body lift and maybe even a guard cut and some LRA flares :o

https://www.aulro.com/afvb/images/imported/2008/05/634.jpg

[loanrangie]

She's a bit tight for space there shorty, i have just finally got around to fitting 265/75/16's on Disco steel rims that i've had for a few years from my previous rangie and find they actually look small even without lifted springs (springs going in tomorrow ). How do the 33's effect the gearing, have barely noticed any difference on mine apart from seems to get going from a rolling start quicker than before.

[Piddler]

here is a pic of my s1 disco with 255/85/16's on the front. I normally run 245/75/16's but when I saw these on it, I was astonished to see what a difference there is in size to the 255/85's.

It is on a RR rim so dont worry about the offset or anything, I was just interested to see what it is like for guard clearance. Keep in mind that the vehicle has a 2 inch suspension lift as well. There is no way I would be taking it bush without a decent body lift and maybe even a guard cut and some LRA flares :o

https://www.aulro.com/afvb/images/imported/2008/05/634.jpg

Check this BFG website gives tyre sizes.
BFGoodrich Tires - Mud-Terrain T/A^KM (http://www.bfgoodrichtires.info/index.php?a=tires.off_road_suv&id=67)

It gives circumference in mm if you use c=3.142 x diameter and transpose it to d=c/3.142 you will get diameter.

I checked BFG American site and they have a wicked looking new Mud Terrain out hopefully we will get soon.

It is a BFG Mud Terrain KM2 instead of our KM version.

[Lucy]

is your Tran auto or manual?, I've got a similar tyre size same radius 225/75/16 with no probs not as wide but still, and still got the original gear box (mines manual don't know if that will make a diff), my advice get a second opinion, just don't tell em that its new box etc, just tell them about your tyre and lift upgrades, see what they say. either way you will find out whos honest.

in the above, Kingyrules was comparing his tyre size to Streaky's, from the previous post.



I have 265/75-16's on my series I Disco combined with Dobinson 2' lifted springs.
I've replaced the front radius arms with 3 degree cranked ones and left the rear standard. I've trimed all four arches and fitted extensions to them.

Now here's here my contension sets in. The Transfer box and gear box started to makes nasty noises on the over-run at 70mph. The work shop who fitted the gearbox and transfer box are saying that the lift and slightly over size tyres are the reason for the premature wear in the gearbox.
Now I think they are talking out of their backside and just don't want to replace the faulty tranny.
Has anyone ever had issues with the gearbox and transfer case because of slighty oversozed tyres and a 2" lift?
We all know that UJ's and propshafts can be subject to vibrations and premature wear...but the tranny also??

I'd be surprised if any one has.



Sorry to be picky, but 225/75/16 is approximately 29.3" (call them 29s), and 265/75/16 is approximately 31.6" (call them 32s). They are very different tyre diameters. Please note, the 75 part of the tyre equation means that the sidewall is 75% the size of the section width (Widest part of the tyre,and not necessarily the width of the tread) - that is, 75% of the first number!

Tyres and tyre sizes, just gotta love them.

PS. I run 245/70/16 Goodyear ATR as daily driver tyres on both Discoveries, and I love them. I run Dunlop MT2 in 235/85/16 for play days on the D1 and the S2a (luckily the wheels are interchangeable); I have a 40mm lift courtesy of some OME coils, and I cut the rear guards on the D1. The Dunlops occasionally rub inside the rear guards on full compression, never worried about it. They also rub on full lock because I didn't adjust the steering stops, again not a major drama. I haven't broken anything in the driveline - yet:twisted:

[PeterM]

If someone is running 33s then you really need to look at either 4.11s or the t/c gearing. 33s are a 13% increase in circ. over stock so make a big difference.

[mcrover]

Ok well what do you want to do here.

Body lift is pretty much for asthetic reasons only until your running over 33" tyres or running offset rims as nothing will foul the guards until then due to the tyres tucking up under the guards.

If you run offset rims or larger than 33" tyres you will crease panels when the tyre hits on articulation unless you extend the bump stops which on a LR is IMHO a ruining a good thing.....Articulation.

With 235 85 16's on mine I find that it is a little slower off the mark and loads up on hills and with a head wind more than with the old 225 75 16's ( I think they were) so a Deefa transfer case would be a good thing to even out the gearing again.

Increasing rolling diameter increases load, increasing load increases fuel usage and loads on driveline so yes it will cost more to run larger tyres unless you take ratios into account.

I have heard that when running 33/34/35" rubber that wheel bearings can be a issue but up to 32" isnt a real issue due to the bearings being designed for the loads that is exerted on them but if you start playing with offsets then it is increasing load again, Im not sure on the exact formula but it increases load on one bearing and not the other and can cause premature failure.

As far as hights go, pull the old sun visor down and check the roof hights and get the tape out to check suspention hight and your tyre placard tells you your standard tyre sizes.

[rovercare]

Body lift is pretty much for asthetic reasons only until your running over 33" tyres or running offset rims as nothing will foul the guards until then due to the tyres tucking up under the guards.

.

Nothing to do with keeping the COG low:eek:, 33's Will foul the inner gaurds, without BL, or your suspension is to hard:D


I have heard that when running 33/34/35" rubber that wheel bearings can be a issue but up to 32" isnt a real issue due to the bearings being designed for the loads that is exerted on them but if you start playing with offsets then it is increasing load again, Im not sure on the exact formula but it increases load on one bearing and not the other and can cause premature failure.

Now thats some crazy shizzle:p, Rover wheel bearing are way oversize compared to most anyhow, never had a problem, or anyone else on 35's that I know of

[Cap]

With my RRC, 33's have def taken to 'grunt' out it, so I will be doing some 4:1 thinggy changes too.

Shorty, just get some 33's on the sucker, ill get my grinder out and we can start making the necessary hacking... err, modifications :D

[2_door]

thanks Matt, I appreciate your help there ;)

Hey Stooge, there will be NO 33's until everything else is done....or until we visit the local coin storage warehouse with oversize beanies on :o:p

I aint rich like you :o

but seriously, they are on the shopping list, just 6 months away yet :(