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

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

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

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

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

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

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.  2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

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

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)

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. RRS P460e
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.

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

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.

it'll be fine  --
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

Do 295s even fit on stardard rims?  --
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

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