Thread: D4 standard 19" rims/tyres

Now - put that onto a big 4WD market for Land Rover - the middle east. They have lots of sand.

What do you do in sand? You let the tyres down, to increase the area, by having the tyre go longer (the width gain is much more marginal).

By having an 18" wheel of the same circumference and width at the standard 19" Discovery wheel, you will get a lot more lift or buoyancy from such 18" tyres when deflated to 20 PSI than with a 19" tyre. The equivalent of 900kg less weight on the back, compared to a similarly deflated 19" tyre.

And that has nothing to do with tyre toughness.

So I reckon Land Rover have been very slack with their wheel requirements.

Plenty of sand over here too. If you stay with LT rated tyres, you will have plenty of capacity to lift your pressure to cope with heavy caravan weights. A lot of AT's max out at 45-50 psi. The LT's have another 10- 15 psi in hand.

I run 265/60/18's, have no issues in sand at 16-18 psi.

Just another compromise by a vehicle manufacturer. They cannot tailor a vehicle exclusively for an extreme user, when the majority of a vehicle's usage is on blacktop. At the end of the day, if you find the bias is not strong enough to harder use in a Disco, you would look at a Defender, would you not ?

Originally Posted by ADMIRAL

Now - put that onto a big 4WD market for Land Rover - the middle east. They have lots of sand.

What do you do in sand? You let the tyres down, to increase the area, by having the tyre go longer (the width gain is much more marginal).

By having an 18" wheel of the same circumference and width at the standard 19" Discovery wheel, you will get a lot more lift or buoyancy from such 18" tyres when deflated to 20 PSI than with a 19" tyre. The equivalent of 900kg less weight on the back, compared to a similarly deflated 19" tyre.

And that has nothing to do with tyre toughness.

So I reckon Land Rover have been very slack with their wheel requirements.

Plenty of sand over here too. If you stay with LT rated tyres, you will have plenty of capacity to lift your pressure to cope with heavy caravan weights. A lot of AT's max out at 45-50 psi. The LT's have another 10- 15 psi in hand.

I run 265/60/18's, have no issues in sand at 16-18 psi.

Just another compromise by a vehicle manufacturer. They cannot tailor a vehicle exclusively for an extreme user, when the majority of a vehicle's usage is on blacktop. At the end of the day, if you find the bias is not strong enough to harder use in a Disco, you would look at a Defender, would you not ?

One bit of difference is that the D4 is marketed as a 4wd and gas one all those awards.

I believe jeep offer an offroad pack which you can opt for at purchase time
Given that 18" rims are viable , re GOE, why do they not offer 18" as an option

After all 18" is mentioned on the plaque as an option.

Instead LR seem to frown upon changing tyre sizes.

I don't believe the defender has the same towing capacity as the D4.

In my case i got my d4 to tow my van in comfort over where ever I want to go. To do this I would prefer a LT tyre which there are none in the 19" range, this may change in the future I suppose
Richard

Originally Posted by letherm

I need to replace 1 tyre after splitting the sidewall last Friday. Still on the OEM ones with only 10,500 km so I'm going to buy the same tyre. Looked on the web and the standard price appears to be $455 fitted and balanced at the usual big name dealers. There are two online stores I saw - TYROOLA for $337 delivered but does not cover fitting etc. TYRESALES.COM.AU for $417 delivered to a dealer and includes fitting and balancing.

Does anyone have any experience with either of the two online stores. Obviously I don't want to run around without a spare for too long.

Martin

I picked up a single tyre from Tyroola - no issues getting delivered from the east coast to WA - delivered to the front door. Another $25 for fitting and balancing at the local tyre place. Saved at least $100 for the tyre, but then found The Tyre Factory had the same tyre on eBay for $50 cheaper again. So just check the price with eBay, lots of tyre dealers are now selling on line via eBay.

Originally Posted by wbowner

One bit of difference is that the D4 is marketed as a 4wd and gas one all those awards.

I believe jeep offer an offroad pack which you can opt for at purchase time
Given that 18" rims are viable , re GOE, why do they not offer 18" as an option

After all 18" is mentioned on the plaque as an option.

Instead LR seem to frown upon changing tyre sizes.

I don't believe the defender has the same towing capacity as the D4.

In my case i got my d4 to tow my van in comfort over where ever I want to go. To do this I would prefer a LT tyre which there are none in the 19" range, this may change in the future I suppose
Richard

Hi Richard, I accept the D3/4 is marketed as a 4wd, but it is still a compromise. I would think the lower profile tyres on 18", 19" and up, are largely to benefit blacktop handling, and to allow the fitment of larger brakes. ( and the looks I guess )

It took Gordon ( GOE ) a fair bit of research, and some trial & error development, to finally lock down a suitable rim. They are a close fit, and while LR could undoubtedly have developed an 18" rim, they already had them from earlier models. I doubt the beancounters would have signed off on the R & D for a further variation with limited application.

Not sure on the Defender 110's but I believe the 130's can tow substantially more than a D4. I am sure someone on the forum can correct me.

Yes, I do seem to recall a post recently on a 19" LT becoming available. They will grow in numbers, as more and more vehicles use them. You only have to look at the availability of tyres in the 18" range compared to a couple of years ago. Used to be 2 or 3. Seem to be dozens now.

I guess what I was trying to say, is that a manufacturer will never exactly match their customer expectations. They would obviously try the match the majority ( customers or expectations ) to get the sales. Which is why the aftermarket does such a roaring trade, as individual owners customise their vehicles to better suit their own needs and requirements. In doing so these owners compromise the original manufacturer specifications, even if it is only in the $'s spent.

All that said, I still believe the D3/D4 is the best compromise in the market place.

Originally Posted by ADMIRAL

Hi Richard, I accept the D3/4 is marketed as a 4wd, but it is still a compromise. I would think the lower profile tyres on 18", 19" and up, are largely to benefit blacktop handling, and to allow the fitment of larger brakes. ( and the looks I guess )

It took Gordon ( GOE ) a fair bit of research, and some trial & error development, to finally lock down a suitable rim. They are a close fit, and while LR could undoubtedly have developed an 18" rim, they already had them from earlier models. I doubt the beancounters would have signed off on the R & D for a further variation with limited application.

Not sure on the Defender 110's but I believe the 130's can tow substantially more than a D4. I am sure someone on the forum can correct me.

Yes, I do seem to recall a post recently on a 19" LT becoming available. They will grow in numbers, as more and more vehicles use them. You only have to look at the availability of tyres in the 18" range compared to a couple of years ago. Used to be 2 or 3. Seem to be dozens now.

I guess what I was trying to say, is that a manufacturer will never exactly match their customer expectations. They would obviously try the match the majority ( customers or expectations ) to get the sales. Which is why the aftermarket does such a roaring trade, as individual owners customise their vehicles to better suit their own needs and requirements. In doing so these owners compromise the original manufacturer specifications, even if it is only in the $'s spent.

All that said, I still believe the D3/D4 is the best compromise in the market place.

Mate agree with what you said and I have been through the tyre saga before on a previous car where it took some time before tyres became available.
Just a pity LR don't cater for it now.
GOE are a very expensive option, mind you if LR did offer the offroad pack they would charge a lot more I reckon 😊

Richard

Originally Posted by ADMIRAL

I doubt the beancounters would have signed off on the R & D for a further variation with limited application.

LR designed new 19" rims for the 2010-2012 Vogue to fit over the even bigger Brembo brakes. Hence I think that LR didn't want anyone to fit tyres with sidewalls taller than those of 19" tyres for steering response purposes trying to push the Disco more up-market that is was previously.

Anyone happen to know whether 18s can go on a 2010 RRS TDV8? It's got 20s at the moment... don't know if they're oversized tyres, but was surprised to see that the speedo is absolutely bang on at 110kph compared to the GPS.

I'd like to at least go 19s for AT options (did I see somewhere there's a 19" Duratrac now?).

There's quite a few 19" wheels on ebay claiming to be OEM RRS, but some of them are as narrow as 7.5? I thought I was looking for 19x9s... There's no way a 7.5 could take a 255 wide tyre, is there??