^^ +1.

Size, load rating, speed rating are all in the handbook I seem to recall. There is no mention of brand or type though, that would be illegal for LR to insist on a specific brand.

When you consider that dimensions and ratings can all have an effect on handling/performance/safety I don't think anyone is being unreasonable in having minimum standards, including insurance companies.

And yes, non-standard would include incorrect sizes, load ratings etc and these would be deemed illegal if you got pulled over unless you were able to demonstrate that they exceed the minimum specifications provided. That's very hard to do with odd sizes. Load indices are easy as a would be a speed rating but sizes are a relational thing which induce stresses into the suspension, wheel bearings etc etc. All a bit subjective and a very good reason to avoid things like 22" wheels from the likes of Khack or O/F.

So I should ditch these?

275 /45 R20's (110) and go for 255/50/20 ? Must be cheaper ?

Has anyone experience of an good AT tyre in that size i.e 255/50/20

Thanks 2013 L405 Autobiography Baltic Blue
2007 L322 Vogue Buckingham Blue

Wow some great replies, I get what everyone is saying about the recommended tyres. I have driven a fair few RR's over the years and lots of other big powerful cars, however, there is no decent AT tyre for the 20 inch rim. I currently have 255/50R20 Yokohama's on there which were ok for the use at the time but no longer. I have driven this particular TDV8 at 135mph and believe me it had more to give!! So I understand the speed rating. My needs have changed I need a decent tyre that will deal with wet, muddy roads, we get a lot of surface water around here, ice, snow and the odd trip into a muddy field for shooting. (I got stuck last year with Yokohama's ). So is it ok to put a 275/45 on a 20 inch rim that LR recommend a 255/50?? Gone: 2005 4.4 Vogue (LHD) Java Black
Gone: 2002 4.4 Vogue (LHD) Java Black
Gone: 1998 4.6 HSE (LHD) Blue
Gone: 1998 4.6 HSE (LHD) Green
Gone: 1997 4.6 HSE (LHD) Silver
Gone: 1996 2.5 DT (LHD) Green
Gone: 1995 4.6 HSE (LHD) Blue
Gone: 1995 4.6 HSE (RHD) Green
Gone: 1995 V8i Discovery (RHD) Blue
Plus a whole host of normal cars!!!!!!!

yes ,a 275/45/20 tyre will fit ...


 ... - .- -.




Y. O. L. O.
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I'm lost! So it fits but isn't insured?

in theory, correct... ... - .- -.




Y. O. L. O.
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If you're bothered, check with your insurer. Simple.

Re 135 mph in an L322 TDV8 - delimited?

Quote:

If you're bothered, check with your insurer. Simple.

exactly !

@crooked, 275 45 20 General AT fit fine - absolutely no issues at all

@ Stan, the tyre calculator is fine for std 275 45 20 tyres. However for the General AT's the tyre size of these is exactly the same circumference as OEM, I measured them and put it down to the extra tread depth of the AT's. Therefore there is absolutely no difference in speedo readings over standard.

@ Rosco there are no 255 50 20 in AT at all, if there were I would have fitted them instead of the 275's  2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

I think it is less a fitment issue and more of a requirement to inform your insurance to put a note on the policy that you are using the different size, they will let you know if they arent happy, and best to discover that first rather than after a prang.

In terms of performance so long as the load and soeed indicees are as quoted in the handbook you will be fine. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
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northernmonkeyjones wrote:

In terms of performance so long as the load and soeed indicees are as quoted in the handbook you will be fine

@Vogue, i'm with you and will fit them, any insurance issues can be dealt with, i.e. reasonably, its not a supercharger and nitrous  2013 L405 Autobiography Baltic Blue
2007 L322 Vogue Buckingham Blue

Just slightly off topic but insurance related. For those of us that use our vehicles off road - particularly in the shooting season when ground conditions can be pretty bad / wet and slippy you need to check that your insurance covers you for off road use.

Many do not - hence why their cover is cheap. I know for a fact that NFU do cover you. I would be more concerned about that than a minor deviation in tyre size.  2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

Agreed, mine is off road 80% of its time towing and other stuff, so as long as insurance know then no problems as yet. I agree if you are onroad most of the time there me be an issue,  2013 L405 Autobiography Baltic Blue
2007 L322 Vogue Buckingham Blue

If they are speed rated above, say, 100mph and one provably does not exceed that speed, is there an issue?