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Jjvd21



Member Since: 20 Dec 2011
Location: Chicago
Posts: 239

United States 
Alternative tire sizes

I've recently come across L494's with tires that are outside of LR's standard size recommendations. I assume that if the L494 is fitted with a tire that is a certain percentage larger or smaller then the vehicle will throw warnings or error codes. I've seen a L494 (SVR) fitted with 285/45 R22 tires, they are 2.6% larger diameter compared to 295/40 R22. This equates to 16 less revolutions per mile. Also seen a L494 fitted with 305/30 R23 (footballer?) tires, they are 3.5% smaller compared to 295/40 R22 and would equate to 23 additional revolutions per mile.

If that's the case how much larger / smaller (%?) can you go before there are problems?

Recommended L494 tire sizes taken from the handbook:
19":
235/65 R19

20":
255/55 R20

21":
275/45 R21

22":
275/40 R22
285/40 R22
295/40 R22 2020 SVR / R.I.P. 2019 SVR / 2016 D4 Landmark / 2005 D3 HSE

Post #592421 Fri Dec 27 2019 11:55pm
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 1532

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

This site might help you in your deliberations

https://www.oponeo.co.uk/advice-and-tips/tyre-size-calculator

They suggest that you should not go outside the range +1.5% to -2.0% overall diameter. Then of course you have to consider whether changing size will result in any fouling of the bodywork, brakes etc. Robin
2008 Range Rover Sport TDV8
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #592428 Sat Dec 28 2019 9:30am
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Coedlan



Member Since: 30 Sep 2016
Location: N. Wales
Posts: 71

United Kingdom 

I don’t see why the car would throw an error code. It won’t know what size wheels or tyres it has fitted
If they were not all the same rolling radius, then yes, the sensors would think there was a problem, with each wheel rotating differently to others
Obviously the speedo is calibrated for the original wheel & tyre size, so going beyond a certain % bigger or smaller, will make the speedo inaccurate

Post #592468 Sat Dec 28 2019 7:36pm
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Estrace



Member Since: 24 Sep 2019
Location: AIGUES VIVES 30670
Posts: 15

France 

wheel-size.com is even better because it gives all OEMstandard tires sizes for all JLR models and gives proper alternatives based not only on diameter or circumference but it takes also into account rim width and offset (very important) as well as scrub radius (very important also), fender clearance, wheel well clearance and suspension clearance so that you are sure that your alternative tire is not going to spoil completely your car handling and safety

The only thing left to worry about is the brake calipers clearance which depends of whether you have the standard calipers or the Brembo ones

Most other tire calculators are only looking at tire diameter and this si far from enough to chose the best alternative tire


I hope this helps choosing the right and best tire

Cheers

Serge

Post #592506 Sun Dec 29 2019 3:35pm
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 1532

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

Just to support Estrace's comments, be very careful about offset as this can really screw you up if you get it wrong. (Bitter personal experience). Especially with Brembo brakes

If I ever buy new wheels again I'll physically fit them to the car before I part with any money - just to be sure they work ok Robin
2008 Range Rover Sport TDV8
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #592508 Sun Dec 29 2019 4:36pm
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Jjvd21



Member Since: 20 Dec 2011
Location: Chicago
Posts: 239

United States 

Thanks for the replies. I'm aware that with different wheels you need to be concerned with offset. I'm just surprised you could run tires that are 2%+ larger or smaller than what is recommended without error codes or other problems. I'm skeptical that it wouldn't cause issues. 2020 SVR / R.I.P. 2019 SVR / 2016 D4 Landmark / 2005 D3 HSE

Post #592521 Mon Dec 30 2019 2:27am
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 8798

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey

You'll only get errors thrown up if tyres are mismatched because that will make the systems think the vehicle is constantly slipping, sliding etc.

If all four tyres are the same size, the systems won't be aware of it - people have been running oversized tyres on RRS since the early days of the L320. I've run 255/55/19 on both of mine instead of the handbook's 255/50/19. That's a +3.4% difference from stock. No issues at all.

The only change you need to be aware of is the speedo's accuracy. Changing the circumference will alter the relationship between speed shown on the dash and speed on the road. A quick check with a GPS will help you there. Thumbs Up 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #592524 Mon Dec 30 2019 9:12am
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 1532

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

Coedlan wrote:
I don’t see why the car would throw an error code. It won’t know what size wheels or tyres it has fitted
If they were not all the same rolling radius, then yes, the sensors would think there was a problem, with each wheel rotating differently to others
Obviously the speedo is calibrated for the original wheel & tyre size, so going beyond a certain % bigger or smaller, will make the speedo inaccurate


I'm with Coedlan here. If you cover off the physical issues with regard to fouling bodywork, brakes etc. then the car should not have a problem except that it will affect the speedo reading and maybe the cruise control. On mine with standard 275 40 R20 tyres, the speedo is near enough bang on but the cruise control is 3-4 mph out. So for 40mph I need to set cruise at 43mph. At 70mph cruise needs to be at around 75mph. Not a problem in practice.

The electronics will look for variances between the revolutions of each wheel and so as long as you have the same size tyres and wheels on all four corners, they'll be fine. I'm not aware of any monitoring of the revolutions at the wheel when compared to revolutions of the engine on the RRS although others here may know more.

I have to admit not being totally on board with how the electronics understands when one wheel is spinning when others are not (when off road say). I thought it was comparing revolutions of each wheel - perhaps someone can enlighten me as to what sensors are involved?

PS - RRSTDV8 has beaten me to it - so hope this adds to that comment Robin
2008 Range Rover Sport TDV8
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #592527 Mon Dec 30 2019 9:30am
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Dave B



Member Since: 10 Oct 2019
Location: East/West Sussex Coast Borders
Posts: 430

United Kingdom 2010 Range Rover Sport TDV8 HSE Santorini Black

Not sure about LR products, but AUDI uses the ABS sensors to determine if any wheel(s) are rotating at different speeds for tyre pressure monitoring and other warnings. 2010 3.6 TDV8 HSE (Gone)
2011 Discovery 4 Commercial SDV6 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)

Post #592528 Mon Dec 30 2019 9:40am
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rangiejools



Member Since: 11 May 2008
Location: Mornington Peninsula Vic
Posts: 184

Australia 

I have run 275/55/20 Pirelli Scorpions on my Sport with no problems. Speedo shows 102 at a real 100kph. With standard 255/55/20s showed 105 at a real 100kph. The larger tyre's circumference is 2.9% larger than the standard one. There was no fouling of bodywork. Brakes are not affected by tyre size only wheel size.
If you want real offroad tyres BFG make a 275/50/20 AT. Ride quality will suffer though due to harder sidewall. SDV8 arrived and fantastic even the infotainment!
1983 2 door Range Rover ARB Bar X9000 winch ARB Rear Bar now semi retired.
Many big trips done in this one.
1982 Rangerover nearly restored.
22 Defender D250 with lots of stuff for outback touring
Nice 2013 Freelander TD4 manual (for daughter to learn on) with much better stereo compared with previous SD4 SE with Meridian which sounded bad!
2013 Land Rover Defender ute.

Post #592553 Mon Dec 30 2019 11:39pm
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Jjvd21



Member Since: 20 Dec 2011
Location: Chicago
Posts: 239

United States 

I can confirm that running 285/45r22 is not a problem Thumbs Up 2020 SVR / R.I.P. 2019 SVR / 2016 D4 Landmark / 2005 D3 HSE

Post #620687 Sat Jan 08 2022 10:12pm
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BlueHorizonUK



Member Since: 09 Dec 2019
Location: Hertfordshire
Posts: 9

United Kingdom 

Can I ask a question please.

My L494 currently has 255x55x20 fitted but the garage says I can fit 255x50x20 on. Are these ok to fit or no? UK based and don’t want to damage the car not fall foul of MOT regs.

Post #637270 Tue Nov 14 2023 1:02pm
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naks



Member Since: 15 Jul 2016
Location: Stellenbosch
Posts: 1107

South Africa 2013 Range Rover Sport Supercharged Siberian Silver

it'll be fine Thumbs Up --
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Post #637271 Tue Nov 14 2023 1:05pm
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naks



Member Since: 15 Jul 2016
Location: Stellenbosch
Posts: 1107

South Africa 2013 Range Rover Sport Supercharged Siberian Silver

Do 295s even fit on stardard rims? Shocked --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

Post #637335 Thu Nov 16 2023 8:02am
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Jjvd21



Member Since: 20 Dec 2011
Location: Chicago
Posts: 239

United States 

No, I believe 10” rims are the minimum. 2020 SVR / R.I.P. 2019 SVR / 2016 D4 Landmark / 2005 D3 HSE

Post #637338 Thu Nov 16 2023 11:55am
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