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For me the lack of ground clearance is much more catastrophic that putting a bit more load on the engine. Things on the underside of the Landie don't like being smacked about by rocks
 

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Oh boy who got Frey started on tire size again;)
 

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I'll rest my case on this even though it's one of my (many)obsessions :) ... cos i've seen too many prematurely failed engines and transmissions caused by nothing else than big tyres mixed with a heavy right foot :serious
 

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What does increased fuel consumption mean for an engine? AFAIK it means that it's working harder or overfuelling for some reason... and that means shorter life too, IMO not a good deal for some inches of extra ground clearance or a "macho" look, i'm just trying to warn everybody about something i deeply studied and tested not to start a debate, the fact that many people does it without really knowing the implications or lack of care is not
valid argument ... though for somebody who doesnt want to keep the vehicle for many years that's certainly not an issue.... bad luck for the man who will buy it thinking that let's say 150.000 Km is not much but that engine and transmission will be well "tenderised" untill then. Only time will tell
I'll rest my case on this even though it's one of my (many)obsessions
... cos i've seen too many prematurely failed engines and transmissions caused by nothing else than big tyres mixed with a heavy right foot
If you are worried about the extra wear and tear, does that mean you don't use a roof rack? Tow a trailer? I tow a travel trailer and it drops my fuel consumption as well. Land Rover seems to think it can handle that function. What about driving into a headwind? My fuel consumption drop is comparable to that... Do you only drive your vehicle down wind?

I have never had an issue with going up a small tire size on any of the 4 other Land Rovers that I have owned. The engines all ran well and did not use any oil.
 

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If you are worried about the extra wear and tear, does that mean you don't use a roof rack? Tow a trailer? I tow a travel trailer and it drops my fuel consumption as well. Land Rover seems to think it can handle that function. What about driving into a headwind? My fuel consumption drop is comparable to that... Do you only drive your vehicle down wind?

I have never had an issue with going up a small tire size on any of the 4 other Land Rovers that I have owned. The engines all ran well and did not use any oil.
Yes, i'm towing a boat and drive against wind or uphill as well with the vehicle equipped as it's recommended by the builder(i've never needed a roof rack) though i'm servicing it with care, what i dont do is to give it additional unneeded stress like bigger tyres cos i respect LR's warnings about that and my own research with clear results... maybe that's why i'm having the same D2 since 2006 and it has almost 300.000 Km and running like new and before that i've owned a Patrol for 16 years which had 580.000 Km on board and ran well, so 2 vehicles in 28 years ... i'm wondering if you are at the 5'th Land Rover now how many miles have you driven with each to see the implications of bigger tyres on a long run? ...
i'm speaking about keeping an engine running up to at least 4-500.000Km without killing it not forcing the sh*t out of a vehicle against official warnings of the builder then sell it to some luckless guy with 150.000 on board and a worn engine then buy a newer one and "kill" that too. :serious
 

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If you are worried about the extra wear and tear, does that mean you don't use a roof rack? Tow a trailer? I tow a travel trailer and it drops my fuel consumption as well. Land Rover seems to think it can handle that function. What about driving into a headwind? My fuel consumption drop is comparable to that... Do you only drive your vehicle down wind?

I have never had an issue with going up a small tire size on any of the 4 other Land Rovers that I have owned. The engines all ran well and did not use any oil.
Yes, i'm towing a boat and drive against wind or uphill as well with the vehicle equipped as it's recommended by the builder(i've never needed a roof rack) though i'm servicing it with care, what i dont do is to give it additional unneeded stress like bigger tyres cos i respect LR's warnings about that and my own research with clear results... maybe that's why i'm having the same D2 since 2006 and it has almost 300.000 Km and running like new and before that i've owned a Patrol for 16 years which had 580.000 Km on board and ran well, so 2 vehicles in 28 years ... i'm wondering if you are at the 5'th Land Rover now how many miles have you driven with each to see the implications of bigger tyres on a long run? ...
i'm speaking about keeping an engine running up to at least 4-500.000Km without killing it not forcing the sh*t out of a vehicle against official warnings of the builder then sell it to some luckless guy with 150.000 on board and a worn engine then buy a newer one and "kill" that too.
I have own a 1955 Series I 107 in addition to my DT and have owned a 1995 which was totalled out at 150k miles by someone running a red light. My 1999 D2 I sold because I wanted something that was longer and could tow better. It had about 160k miles on it as well. My 2008 D3 I traded it in for my D5 as it struggled towing across the great plains. The and the V8 was a gas hog. The D5 has been excellent with the TD6. I also have a 1972 FJ40 that has much larger than stock tires, and it has had no issues. I have owned it since 1990.

I guess if you can provide us with where Land Rover has published recommendations stating that they do not recommend going up a larger tire size, I would be interested in reading it.

From my experience I have had more fuel consumption drop due to have having a brush guard and a roof rack than larger tires. So I feel that your comments about the bigger tires only affecting the engine versus other potential thing being terrible to the vehicle seems narrowed minded. But I will leave you to your opinion because I don't think this worth any more comments. Other than I would still like to read Land Rover's statement on the larger tires.
 

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jaacina said:
My 1999 D2 I sold because I wanted something that was longer and could tow better. It had about 160k miles on it as well. My 2008 D3 I traded it in for my D5 as it struggled towing across the great plains.
If you had bigger than standard dimension tyres on the D2 and D3 or not inflated to the exact pressures recommended in the owner's handbooks that's the reason why they didnt tow well... cos the bigger tyres with wrong pressure reduced the torque, even std tyres with wrong pressures affect the towing capacity so just imagine if the pressure has such effect what effect has a different diameter... dont get me started to explain what's the VSS, how it's a vital part of the electronic management's addaptive strategy and what's the result of messing with it.... i did it in some other thread , i'm not gonna do it again
jaacina said:
.....I guess if you can provide us with where Land Rover has published recommendations stating that they do not recommend going up a larger tire size, I would be interested in reading it.....
It seems you didnt read this whole thread, nor many owner's handbooks, it's in post #13 first page copied from a D4 owner's handbook, comment that ... and if you'll read the thread carefully from the beginning you'll see that my recommendation against bigger tyres is for the vehicles with complex electronic management not for ''classic'' pure mechanical ''plants" ;)
even more warnings are to not even inflate the tyres to different than the recommended pressures but i'm not gonna copy/paste the pages from all the owner's handbooks here, as i said i dont want a debate, the simple fact that the engine's consumption is higher caused by an additional ''stress" induced by the vehicle's owner is enough evidence that it's not a good move... that's not about headwind or a hill or roof rack or other sporadic element, it's something permannent made against logic and recommendations...he web is full of scientifically documented articles based on live tets about the ill effects of bigger diameter tyres on a vehicle, i did my research.... vehicles used mainly for off-road excluded
 

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jaacina said:
My 1999 D2 I sold because I wanted something that was longer and could tow better. It had about 160k miles on it as well. My 2008 D3 I traded it in for my D5 as it struggled towing across the great plains.
If you had bigger than standard dimension tyres on the D2 and D3 or not inflated to the exact pressures recommended in the owner's handbooks that's the reason why they didnt tow well... cos the bigger tyres with wrong pressure reduced the torque, even std tyres with wrong pressures affect the towing capacity so just imagine if the pressure has such effect what effect has a different diameter... dont get me started to explain what's the VSS, how it's a vital part of the electronic management's addaptive strategy and what's the result of messing with it.... i did it in some other thread , i'm not gonna do it again
jaacina said:
.....I guess if you can provide us with where Land Rover has published recommendations stating that they do not recommend going up a larger tire size, I would be interested in reading it.....
It seems you didnt read this whole thread, nor many owner's handbooks, it's in post #13 first page copied from a D4 owner's handbook, comment that ... and if you'll read the thread carefully from the beginning you'll see that my recommendation against bigger tyres is for the vehicles with complex electronic management not for ''classic'' pure mechanical ''plants"

even more warnings are to not even inflate the tyres to different than the recommended pressures but i'm not gonna copy/paste the pages from all the owner's handbooks here, as i said i dont want a debate, the simple fact that the engine's consumption is higher caused by an additional ''stress" induced by the vehicle's owner is enough evidence that it's not a good move... that's not about headwind or a hill or roof rack or other sporadic element, it's something permannent made against logic and recommendations...he web is full of scientifically documented articles based on live tets about the ill effects of bigger diameter tyres on a vehicle, i did my research.... vehicles used mainly for off-road excluded
The tire size had nothing to do with the D2 having trouble towing. It was tongue weight, short wheelbase and a long distance between rear axle and hitch. The D3 handled the weight but again on hills the V8 was working hard. I have 25' travel trailer.

I did miss your attachment in post 13 as I have been reading on my phone. Reading the warning I agree that larger tires and raising the vehicle via a suspension lift can affect stability. I also understand how tire size can be affected by improper inflation which can change the tire diameter and how that can affect the electronic traction control. I can see that causing more issues with drivetrain than the extra rotation mass prematurely wearing out your engine.

I still think using the vehicle to tow, and I have already put over 6k miles on mine towing over 6k lbs, is going to be harder on the engine than a tire that is less than 2" taller and 20lbs heavier.

But I will take your warning.
 

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I still think using the vehicle to tow, and I have already put over 6k miles on mine towing over 6k lbs, is going to be harder on the engine than a tire that is less than 2" taller and 20lbs heavier.
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I completely agree with that, i dont contradict any of the statements that everything which makes the engine work harder will affect it...all i was trying to warn everybody is to not give it extra stress for an unneeded and unrecommended thing like larger tyres cos it will give only a bit more grip and ground clearance eventually more macho look which weighs against all the system's functionality and engine's longevity that's all ... IMO all the modells were very capable for what they were designed to as they left the factory... again vehicles used mainly for off road excluded
 

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I still think using the vehicle to tow, and I have already put over 6k miles on mine towing over 6k lbs, is going to be harder on the engine than a tire that is less than 2" taller and 20lbs heavier.
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I completely agree with that, i dont contradict any of the statements that everything which makes the engine work harder will affect it...all i was trying to warn everybody is to not give it extra stress for an unneeded and unrecommended thing like larger tyres cos it will give only a bit more grip and ground clearance eventually more macho look which weighs against all the system's functionality and engine's longevity that's all ... IMO all the modells were very capable for what they were designed to as they left the factory... again vehicles used mainly for off road excluded
The wear and tear I am most concerned about is the below zero Fahrenheit days start ups. Driving on the rough frost heaved roads and such. But they are bought to be used.
 

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I also went with bigger tires so I could get a heavier load capacity for towing my trailer. Wanted that extra safety margin.


I still think using the vehicle to tow, and I have already put over 6k miles on mine towing over 6k lbs, is going to be harder on the engine than a tire that is less than 2" taller and 20lbs heavier.
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I completely agree with that, i dont contradict any of the statements that everything which makes the engine work harder will affect it...all i was trying to warn everybody is to not give it extra stress for an unneeded and unrecommended thing like larger tyres cos it will give only a bit more grip and ground clearance eventually more macho look which weighs against all the system's functionality and engine's longevity that's all ... IMO all the modells were very capable for what they were designed to as they left the factory... again vehicles used mainly for off road excluded
The wear and tear I am most concerned about is the below zero Fahrenheit days start ups. Driving on the rough frost heaved roads and such. But they are bought to be used.
 

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I went with larger tires because I off-road mine and the utter **** tires it came with are an embarrassment to the vehicle's capabilities, and there are literally zero choices for true AT's in the OEM 20" size. When you flat from a rock drill via a pebble the size of the end of your pinkie finger as I did, you need better tires.

The talk of stressing the engine and/or driveline is pretty ridiculous, actually - maybe it would have an effect if we were talking about fitting 35's to a 60hp Willys Jeep, but the difference to the driveline of a vehicle making close to 300hp, or for the diesel, over 450lb-ft of torque is negligible. That same 8sp ZF transmission is fitted to vehicles making far more torque and HP than the Disco - such as the 575hp F-Type SVR and the RRS SVR, among others, without any re-engineering. That application of power and torque is far more stressful than turning 12lb more rubber.
 

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Let's all get Jag F types;)

Dammmmmmm that's a car
Love that exhaust sound. :)
Although their dependability Offroad is questionable
 

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The arguments about the effect of bigger tyres were based on the effect of the VSS(vehicle speed signal) input for the engine management as the whole fuelling strategy was mapped for standard dimension tyres as a certain VSS should match a certain driver demand and load feedback... i'm not gonna' keep the whole complicated theory here, each for his own but my advice is to not compare the LR with other makes which have different mapping or with tractors , those vehicles with same powertrain and more power are "calibrated" for that from factory, bigger tyres are like you drive the vehicle fully loaded or towing something all the time = higher EGTs and that means premature wear, believe it or not.... if you want to be on the safe side get your vehicle remapped as the management to be addapted for those tyres...then you'll feel the benefits
 

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The effect on the driveline for a tire that's less than 1" taller is negligible. I ran a 1.1" taller tire on my 2010 Touareg TDI for 6 years and over 100,000 miles with absolutely no ill effects - including some quite spirited mountain driving, and frequent off-roading including desert runs, and lots of highway miles in between. This on a vehicle known for eating driveshaft center bearings, turbos, and high pressure fuel pumps, among other mechanical stress-related failures, none of which I ever had.

The difference in height between a 255/55-20 and 275/55-20 is 0.9" and 18 revs per mile. At 70 mph I'm actually traveling 72mph. The odometer calibration and speed calibration have nothing to do with engine or drivetrain wear. The car thinks it's doing 70mph regardless of how tall the tire is and will adjust fuel flow and turbo vane angle as required.

Any extra engine "stress" comes from the increased rotational mass and any difference in rolling resistance the engine has to overcome to accelerate or maintain speed. And on a tire that weighs 3-4lbs more, those effects are negligible for a vehicle like the Disco. Driving into a stiff headwind on a long road trip has a bigger effect.
 

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So back to the original question

Or let's talk about F types;):)
 

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Installed Cooper XT4 275/55-20s on the stock rims of my 2017 and have had no rubbing issues so far for all height settings.

Went with the Coopers after a lot of searching as they have a long tread warranty for the SUV sizes, high load rating, severe weather rated and were a better price than much of the competitors that are severe weather rated. So far they are quiet on the highway, but have only had a brief bit of gravel and very little true offload conditions to really test them. Snow hasn't started to fly, but would really like to test them in on snow and ice as reviews have compared them against full winter tires with good results.

My biggest issue right now is that I only have the donut spare and sourcing a 20" spare rim with the right specs seems to be impossible or expensive. Only option right now is to go with an aftermarket aluminum rim or buy a matching LR rim (LR Canada wants over $1500, but I've seen US pricing closer to $500). Anybody else run into the spare rim issue.
 

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I swapped the OEM wheels/tires (including the spare) for 285/50-20 Nitto Terra Grappler G2s on 20"x9.5" Redbourne wheels (ordered the wheels from Amazon). Didn't need Johnson Rods and no clearance problems.
 

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