20in wheels for Disco 3

[sheckster]

Hi folks,

I'll be receiving new wheels/tyres soon, they're are 20in with 275/40R20. Tyres are Continental 4X4 Sport Contact.

I'm just wondering if anyone else have the same setup on a Disco 3 and if so are they any issues anyone has come across?

What would be the ideal psi? I'm thinking 40.

Wheels are original LR (from RRS supercharged) so I'm hoping the load rating would suffice for the disco 3.

I'm still keeping the 18 in OEMs for now but might dispose of them if the 20's are ok.

Thanks.

[sniegy]

Hi Sheckster,
On the D4 the tyre size is 255/50/20, one of the problems will be witdh, I had a friend who was running these & said they extremely close to the inner shocks/can.
The tyres size will be a little under as they are for the Sport & in the entire range they run 5% difference in size..
EG: the 18" rims 255/55/18 for Sport. 255/60/18 for D3/4,
same with the 19" rims 255/50/19 Sport, 255/55/19 for D3/4.
So just take note the speedo will be out a little.

The other problem you will have is you will feel EVERY bump, ant, fly, rock on the road. You will also get a lot of jolts throught the steering as the steering rack is not set up for the 20"s.
I would run 36/38 psi & then trial run yourself until comfortable.
PDI settings are 33/36 for all tyre sizes.

Good luck.

[Disco4SE]

Hi Sheckster.
Good on you mate. Nobody has mentioned 19" rims lately for the fear of a massive attack from others, and you come right out with a query on 20" rims. If you like them and they look good, do it.

[sheckster]

Hi Sheckster.
Good on you mate. Nobody has mentioned 19" rims lately for the fear of a massive attack from others, and you come right out with a query on 20" rims. If you like them and they look good, do it.

:D I know, I was actually waiting for some feedback. I'm well aware they're not everyone's cup of tea but I thought I'd try it out. Even LR here in Brisbane told me only up to 19 for the Disco 3

here's what I'm putting on
RANGE ROVER 20INCH-STYLE7 ALLOY Diamond turned finish - eBay Wheels, Wheels, Tyres, Car Parts, Accessories, Cars, Bikes, Boats. (end time 30-May-10 20:10:00 AEST) (http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=290437228585&ssPageName=STRK:MEWAX:IT)

[sheckster]

Hi Sheckster,
On the D4 the tyre size is 255/50/20, one of the problems will be witdh, I had a friend who was running these & said they extremely close to the inner shocks/can.
The tyres size will be a little under as they are for the Sport & in the entire range they run 5% difference in size..
EG: the 18" rims 255/55/18 for Sport. 255/60/18 for D3/4,
same with the 19" rims 255/50/19 Sport, 255/55/19 for D3/4.
So just take note the speedo will be out a little.

The other problem you will have is you will feel EVERY bump, ant, fly, rock on the road. You will also get a lot of jolts throught the steering as the steering rack is not set up for the 20"s.
I would run 36/38 psi & then trial run yourself until comfortable.
PDI settings are 33/36 for all tyre sizes.

Good luck.

Thanks Sniegy, as per usual, you always got the info and facts. I will update on how it goes when I get it. I'm already bracing myself for the bumps, exact reason for keeping the 18's. With the speedo though, if it's saying 100k/hr, is it really 95 or 105?

cheers

[sniegy]

If your speedo is reading 100 you will actually be doing approx 95K/Hr.
Its not a true 5% as the percentage is tyre percentage not mathematical percentage.
If u have a GPS or could borrow someones for a quick spurt up the highway, this wil give you a better reading of differences for reference.

Cheers Mate.

[rmp]

Hi Sheckster.
Good on you mate. Nobody has mentioned 19" rims lately for the fear of a massive attack from others, and you come right out with a query on 20" rims. If you like them and they look good, do it.

To be precise...in my mod warning about this topic I referred only to changing the topics of threads to rims. I did say if you want to create a new thread as has been done here so no issue. People who feel they're read enough on the subject can now easily avoid it.

Now if this post had been made in a non-rim related thread that would have been a concern.

[rmp]

Hi folks,
What would be the ideal psi? I'm thinking 40.



The correct pressure depends on the vehicle weight. Mine is heavily accessoried so I run 40psi and tyre wear had been excellent. For a lighter car I'd run lower pressures. I would start at say 38 and work it out from there, use some of the standard techniques such as increase of 4psi from cold to warm, chalk line across the width to check for even wear, how it feels.

[rmp]

You will also get a lot of jolts throught the steering as the steering rack is not set up for the 20"s.


Why does the rim diameter make this difference to the steering setup?

[sniegy]

This is especilly so on early vehicles up to 7A Model Year.
The steering rack is set up different for the rim size - internally.
I remember when we received the first batch of Sports as you could option up for 20's. But could only do so from factory otherwise you would hate the drive as you would feel every bump & the steering wheel would transmit alot of NVH quite badly to the driver & at idle you would feel the diesel harshness.
Being like when having a TD5 with shot engine mounts.
LR then decided to fit the rack to all vehicles.
As i have only just found out the rack in the new 3.0ltrs have this "new" rack standard, but the 2.7ltrs "might not".

Hope this clarifies a few things:D

[AnD3rew]

Once you have the 20's on we would expect you will post some pic's:)

[sheckster]

Once you have the 20's on we would expect you will post some pic's:)

Absolutely. I'm getting them done today at LR brisbane just to be safe. I said to them the wheels are 20in and they said no problems and that they'll have to set something in the vehichle for it to cope with that size wheel. Not sure what that is though, perhaps for the steering?

Now will have to ring insurance, again, to be safe. :D

[rmp]

This is especilly so on early vehicles up to 7A Model Year.
The steering rack is set up different for the rim size - internally.
I remember when we received the first batch of Sports as you could option up for 20's. But could only do so from factory otherwise you would hate the drive as you would feel every bump & the steering wheel would transmit alot of NVH quite badly to the driver & at idle you would feel the diesel harshness.
Being like when having a TD5 with shot engine mounts.
LR then decided to fit the rack to all vehicles.
As i have only just found out the rack in the new 3.0ltrs have this "new" rack standard, but the 2.7ltrs "might not".

Hope this clarifies a few things:D

Yes it does, thanks, explains what models have what. But I'm still unclear as to why, and especially why the idling makes any difference.

[sheckster]

Here are some pics, apologies though as I used a mobile phone to take them and disco in garage.

Handling around town, bends and turns is definitely better. The wide tyres (275/40/R20) gives a feeling of more grip. Bumps wasn't as bad as I thought they would be, didn't really feel jolts being amplified through the steering wheel.

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[sheckster]

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