Please Recommend Larger Tire Size for Disco 5 W/O Lifting - Page 2 - Land Rover Forums : Land Rover and Range Rover Forum
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post #16 of 40 (permalink) Old 02-05-2018, 11:04 PM
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.... The increased capability that comes with more off-road suitable tires is worth the small sacrifice in fuel economy. The other adverse effects you cite are so insignificant as to not even be noticeable. If I'd wanted an everyday SUV for on-road use only, I could have gotten one for less than half the price of the Discovery.
I didnt say to not put off-road suitable tyres i said it's not good to put larger ones(which for me means bigger diameter) and that LR made warnings against that... IMO any Discovery is more capable off-road with standard dimension tyres while all it's enhancements are working at 100% capacity and that few inches of extra ground clearance are neglectable with unneeded adverse effects.... though if you wanted an off-road vehicle which is far better than the Discovery for that and no need to think about tyre dimensions as it has them big from factory you could have bought it for half the price of a it as well
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post #17 of 40 (permalink) Old 02-07-2018, 01:48 PM
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I installed the Good year Duratracs in 275/55r20s in October. They have worked well. Fuel mileage dropped, but that is also due to it being cold in MN.

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post #18 of 40 (permalink) Old 02-08-2018, 06:19 AM
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I installed the Good year Duratracs in 275/55r20s in October. They have worked well. Fuel mileage dropped, but that is also due to it being cold in MN.
That is the size I am looking at. Just to clarify; did you install them without any lift or other modification? Also, assuming you have a full-size spare, did it fit as well? Thanks so much.
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post #19 of 40 (permalink) Old 02-08-2018, 12:54 PM
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I have 275/55-20 Cooper Discoverer AT3 and there's absolutely no rubbing or any other issues aside from reduced fuel economy. Ride is superb even with slightly greater unsprung weight.

Many others have fitted that size as well - lots of selection in that size.

Full size spare fits fine. No lift. Have had it off-road in Super Extended Mode even.

Yes, I do take it off-road.
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post #20 of 40 (permalink) Old 02-08-2018, 01:21 PM
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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

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post #21 of 40 (permalink) Old 02-08-2018, 01:30 PM
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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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post #22 of 40 (permalink) Old 02-08-2018, 01:58 PM
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Oh boy who got Frey started on tire size again

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post #23 of 40 (permalink) Old 02-08-2018, 02:07 PM
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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

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #24 of 40 (permalink) Old 02-09-2018, 05:40 AM
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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
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I'll rest my case on this even though it's one of my (many)obsessions [IMG class=inlineimg]http://landroversonly.com/forums/images/smilies/smile.gif[/IMG] ... cos i've seen too many prematurely failed engines and transmissions caused by nothing else than big tyres mixed with a heavy right foot [IMG class=inlineimg]http://www.landroversonly.com/forums/images/LandRoversOnly2/smilies/tango_face_plain.png[/IMG]
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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post #25 of 40 (permalink) Old 02-09-2018, 04:30 PM
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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.

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2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #26 of 40 (permalink) Old 02-09-2018, 05:47 PM
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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. [IMG class=inlineimg]http://www.landroversonly.com/forums/images/LandRoversOnly2/smilies/tango_face_plain.png[/IMG]
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.

Céad Mile Fáilte,

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post #27 of 40 (permalink) Old 02-09-2018, 08:06 PM
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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
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.....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

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.

Last edited by sierrafery; 02-09-2018 at 09:10 PM.
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post #28 of 40 (permalink) Old 02-10-2018, 04:09 AM
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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
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Originally Posted by jaacina
.....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.

Céad Mile Fáilte,

James Cina

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post #29 of 40 (permalink) Old 02-10-2018, 09:00 AM
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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.
.
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

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #30 of 40 (permalink) Old 02-10-2018, 10:39 AM
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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.
.
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.

Céad Mile Fáilte,

James Cina

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