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  #7477  
Old 10-08-2013, 04:59 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by SJandL View Post
I wasn't aware of that thread Russell - Thank you.
Interesting that your tyre guy suggested Toyos, and he had seen your tyre - as far as I know they don't come in our size. BTW, I am on a farm too, and one of my objectives is a tyre for wet grass and mud. The Bridgestones don't look aggressive enough for some of my mud -- that's why I got the Goodriches originally for the LC. But I am keen on maintaining the factory size (many others don't think that is as important however).
Russell
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  #7478  
Old 10-08-2013, 05:32 AM
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Re: 2014 Grand Cherokee information - Australia

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Interesting that your tyre guy suggested Toyos, and he had seen your tyre - as far as I know they don't come in our size.
They don't? Well - there you go. He did give me the brochure but I have left it on husband's desk without taking a look inside. I'm sure he would have picked up on this slight issue.

Goodriche - is that what you are recommending?
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  #7479  
Old 10-08-2013, 05:34 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by lt4vette View Post
Note that if go oversize at all, then you need to change your spare to the same size, and this raises issues of fitting it in the wheel well - some might fit, some don't.
Russell
Yeah, technically... but no, I'm not going to myself.

It's important you can transport your oversize road wheel home, so it must kinda fit in the spare wheel well... ish. Most of the oversize tyres will go in, though the lid will certainly sit proud a little. Your luggage will hold it down...

As far as the rotational difference, consider the scenario of a brand new spare taking place of one of four almost munted road tyres. The percentage difference will be getting close to those oversize options I've listed, yet typically no one even considers the drivetrain or handling when driving off with that 0km old spare in place of the bald predecessor. Is it an issue? Well, it depends on how fast and how far...

If I had a front flat in the North West and was fitting my "now undersized" factory spare for the run home, I'd probably accept some juggling was in order to position the mismatched tyre on the rear. I'd drive a bit more leisurely too. However the fact is there's a pretty good chance I won't be coming home with a flat at all, because I'm going to set out with the right rubber in the first place. The last tyre destruction I experienced in well over ten years 4WDriving was on a "Passenger rated" tyre. Lesson learnt. Taller sidewalls are more forgiving too, so I'm going to get as much under the car as I practically can.

Now don't get me wrong... I'm not saying it can't happen. Hell, you can get two destroyed tyres in one hit quite easily, but all you can do is make a judgement call on risk versus benefit and go with that. If you believe you need a 100% equivalent spare... or two... you'll get only nods of approval from me. I don't think I do personally, so I'll take the factory sized spare and my satphone, because fitting an HF radio doesn't fit into the risk versus benefit equation now either.

Really, if you do a risk assessment of going into nowhere with one of these things... you'd recant and take a naturally aspirated diesel instead.

2 cents inserted,
Steve
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  #7480  
Old 10-08-2013, 05:44 AM
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Re: 2014 Grand Cherokee information - Australia

barboots,
You really cannot use unmatched undersized or oversized wheels on the car.
This is because it will screw up the driveline, as the wheels will not be rotating at the same speed and cause severe damage. The cars ECU may also throw a fit, as it will know there is a rotational difference and may shut the whole system down.
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  #7481  
Old 10-08-2013, 05:47 AM
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Re: 2014 Grand Cherokee information - Australia

How about this?

I need 5 new tyres. Which ones would you recommend?
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  #7482  
Old 10-08-2013, 05:50 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by ENFORCER View Post
barboots,
You really cannot use unmatched undersized or oversized wheels on the car.
This is because it will screw up the driveline, as the wheels will not be rotating at the same speed and cause severe damage. The cars ECU may also throw a fit, as it will know there is a rotational difference and may shut the whole system down.
Please do the calculations on a set of proper offroad ~810mm diameter tyres with ~10mm of tread missing when the "as new" spare goes on. You'll see it's much the same.

Cheers,
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  #7483  
Old 10-08-2013, 05:53 AM
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Re: 2014 Grand Cherokee information - Australia

Hi All,

here is the Summit vs Overland comparison I promised. Sorry its taken so long, was away with work a little longer than I wanted to be.

Overland owners, you will be pleased to know that there is something the Overland comes with that the Summit doesn't. I was quite surprised.
Attached Files
File Type: pdf Summit vs Overland.pdf (76.6 KB, 52 views)
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  #7484  
Old 10-08-2013, 06:00 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by SJandL View Post
How about this?

I need 5 new tyres. Which ones would you recommend?
If I was fitting up 18"s as per your usage I'd probably fit standard size Bridgestone D697 due to their stronger LT construction, but you may be happier with the softer ride from a Scorpion ATR or the Cooper ATR (though I didn't check their construction, I think it's Passenger in this size so therefore "softer").

It's hard to recommend tyres, as personal definitions vary immensely.

Cheers,
Steve
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  #7485  
Old 10-08-2013, 06:09 AM
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Many thanks Snuke
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Old 10-08-2013, 06:20 AM
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Re: 2014 Grand Cherokee information - Australia

If I was to stick with the stock size (which I didn't ) I'd go for the Bridgestone D697.

But I love the extra clearance and look of the 275/65's.
After my trip up north, my boot now closes fully. Looks like the mrs' extra shoes payed off...
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Old 10-08-2013, 06:20 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by iboughtajeep View Post
Hi All,

here is the Summit vs Overland comparison I promised. Sorry its taken so long, was away with work a little longer than I wanted to be.

Overland owners, you will be pleased to know that there is something the Overland comes with that the Summit doesn't. I was quite surprised.
I take it the items highlighted in Green are ones that do not show on your Overland build.
Some of those are not Summit exclusive items, some show on my Limited build sheet. Certain items re tracking may be date related.

So the upgrades/differences over/to the Overland are:

RCAS: 19 SPKRS High Perf Audio
LMQS: Adaptive Bi-Xenon HID Headlamps
MF1S: Body Color Grille w/Chrome Inserts
WSCS: 20X8.0 Aluminum Polished Wheels
*HL: Leather Trimmed Bucket Seats
C1CP: #3 Seat Foam Cushion
JJAP: Cigar Lighter
RDHP: 825 Watt Amplifier
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  #7488  
Old 10-08-2013, 06:24 AM
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Originally Posted by lt4vette View Post
If you haven't already, check out this thread: Off Road 18"s EDIT: Post number one is where Barboots gives the results of his considerable research. I am going to replace my 18" Khumos with the Bridgestone 697's I think, as I want a Light Truck tyre for the tougher sidewalls, and they are the only one in the stock size. My next choice would be the BF Goodrich A/T's, which are only slightly oversize, but I have consistently got over 80,000km on my Landcruiser. Russell
Having completed the Stezlecki Track in July on a set of Brigdestone 697’s on my Dad's 4x4, these will be my choice when the Khumos are worn out. The road from Innaminka was shocking, but the 697 hardly took a beating. I've recently returned from Carnarvon Gorge with our Camper and the Khumos (18") were fine, but the track was well graded. I will certainly be rotating these tyres early to keep the tread even. By the time I do the Nullabor over Christmas, I'll have a good understanding of how far the Khumos will last. Not planning on any heavy 4x4 driving until I make the change. Just my opinion.
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