Please Recommend Larger Tire Size for Disco 5 W/O Lifting - Page 3 - Land Rover Forums : Land Rover and Range Rover Forum
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post #31 of 40 (permalink) Old 02-10-2018, 10:44 AM
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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.


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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.

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post #32 of 40 (permalink) Old 02-19-2018, 07:44 AM
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I went with larger tires because I off-road mine and the utter shit 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.

Yes, I do take it off-road.
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post #33 of 40 (permalink) Old 02-19-2018, 08:41 AM
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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

Happy Happy Happy

2002 D2 se7 6 seater . complete engine rebuild with flanged liners , 2 inch lift, terrafirma shocks, LT 275/65r18 Cooper stt tires, d1 modified front bumper, safety devices rack, 30" l.e.d. Light bar
2004 D2 se5 (sold)
2001 D2 se5 (parts truck)
2000 D2 se7 (retired)
1997 D1 (sold)
1957 Series 1 88" future projet
2006 Suburu legacy outback (gets me around when the disco is not)
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post #34 of 40 (permalink) Old 02-19-2018, 08:54 AM
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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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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 #35 of 40 (permalink) Old 02-19-2018, 03:25 PM
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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.

Yes, I do take it off-road.
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post #36 of 40 (permalink) Old 02-19-2018, 04:16 PM
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So back to the original question

Or let's talk about F types

Happy Happy Happy

2002 D2 se7 6 seater . complete engine rebuild with flanged liners , 2 inch lift, terrafirma shocks, LT 275/65r18 Cooper stt tires, d1 modified front bumper, safety devices rack, 30" l.e.d. Light bar
2004 D2 se5 (sold)
2001 D2 se5 (parts truck)
2000 D2 se7 (retired)
1997 D1 (sold)
1957 Series 1 88" future projet
2006 Suburu legacy outback (gets me around when the disco is not)
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post #37 of 40 (permalink) Old 09-12-2018, 07:58 PM
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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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post #38 of 40 (permalink) Old 10-23-2018, 06:14 PM
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went with 275 50 20 KO2, such a great tires, no rubbing at all at access height. and ride like normal tires on the hwy. Didn't find any road noise different vs stock.
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post #39 of 40 (permalink) Old 04-14-2019, 08:11 AM
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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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post #40 of 40 (permalink) Old 05-14-2019, 08:35 AM
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Nice! Looks great.

Yes, I do take it off-road.
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