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  #73  
Old 03-21-2014, 11:30 PM
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Re: Off Road 18"s

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Originally Posted by shellhall5183 View Post
all I can say is get annoying some times what you get told!. I looked at those ones on Ebay to thinking should I try them wish I did. Yes tires are very expensive, looking at either Cooper AT3's $475ea or Bridgstone 697's @ $540 Ea... Looked at Tire rack in the states and can get them shipped here but then the dealer will not fit them as its not "their" tyre.. so either way they kinda have you pinned. still contacting other tire dealers to find out if they will fit tyres from the US.
ring around, I have previously had tyres put on wheels that were not purchased

I paid from memory $85 for fitting an balancing 5 tyres

there was a caveat on the invoice which stated the tyres were not to be warrantied

btw, bob jane and beaurepairs had zero interest. Others did

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  #74  
Old 03-21-2014, 11:49 PM
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Re: Off Road 18"s

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Originally Posted by BobT View Post
At the moment I'm using 37psi. My only logic for 37psi is that it the placard pressure plus 4psi for high speed but I'm still researching the subject. Neither Bridgestone nor Jeep are any help at all. The Bridgestone guy who sold me the tyres suggested pressures from 38-50psi because that's what he uses on his ute. I contacted Bridgestone officially. They were non-committal and wouldn't be swayed from anything other than the placard pressure, probably for legal reasons. Their literature continually talks of using the “correct” pressure but they won’t tell you what that is. The only bit of sense I got was out of Allan Whiting who advertises Bridgestones in the mags. He emailed, "Your new D697s will work well at the Jeep recommended pressure of 33psi, while you’re running around town lightly laden. For higher speeds I’d up the pressures slightly to around 35psi. if you’re fully loaded the dealer’s suggestion around 38spi is what I’d be using. Don’t forget to rotate the tyres every time the Jeep is being serviced, to maximise your tyre life."

Yokohama recommends using 5-15psi more in LT tyres than in the equivalent passenger tyre but then that’s for their tyres. Opinions vary widely and it is frustrating that those who should know don't or are unwilling to comment. I've written more on this here Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Whith the camper trailer in tow, I intend to use 29psi in the front and 45psi in the back and see how it goes. I worked this out by putting the car and trailer over a weighbridge, applying using load/inflation tables then adding some.


There is a very simple method of calculating cold pressure (been using this for a very long time, on cars and boat trailers with a happy balance between fuel consumption and ride handling - no flat spots, no scalloping, no uneven wear ((except when one of my shockers failed)))

1. Look at tyre specs, it will state maximum load at a certain PSI (there is alot of misinformation)) 60PSI to carry 1300 kg

2. Work out weight of vehicle (you can get this from brochure, add the number of people + other stuff you carry + towball downforce)
eg Wk2 VM Motari Laredo 2300Kg + fat **** 100kg + deep cycle & fridge 50 kg + recovery & towbar & nudge 50 kg = 2500kg now towing, or towing 2600 Kg



3. Divide weight of vehicle by 4 (4 wheels)
each wheel, on even ground has (2600kg /4 = 650)
(if you ever want to know the weight distribution between front vs back go to your local tip, they often have a weigh bridge)

4 Work out how what 650KG is compare to maximum of tyre
eg if max is 1300 kg @ 60 PSI, only 650 kg @ 30 psi is required

5 Add 20% for rolling resistance / maximum fuel economy

30 psi, 20% is 6 psi so use 36 PSI cold pressure
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  #75  
Old 03-24-2014, 08:20 PM
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Re: Off Road 18"s

Well I couldn't resist the Cooper ST Maxx, so 4 are on order in LT275/65R18. Should be here in mid April..... $490 a corner.
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  #76  
Old 03-24-2014, 09:18 PM
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Nice one Benn0... I would have liked to get them but couldn't wait. I hope the ETA is based on reality!

Cheers,
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  #77  
Old 03-24-2014, 09:37 PM
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Re: Off Road 18"s

Me too, the Dynapros are the fall back. One shop said early May, which is a little too late. Good Year said 2 weeks. My car should be arriving end of April, so a little bit of room to move....
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  #78  
Old 03-28-2014, 05:29 AM
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Re: Off Road 18"s

Had these fitted today. $230/rim, $395/corner for D 697's and under a $100 for 4 TPMS sensors delivered to the door. Trip to Flinders Ranges next week, didn't want to risk the 20"/Khumos in some of those rock strewn creeks and hill climbs. Hardly notice any increase in tyre noise at highway speeds. TPMS picked up in Uconnect as soon as some k's done, no 're-programming' required as suggested by a couple of dealers.
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  #79  
Old 03-28-2014, 05:51 AM
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Originally Posted by Berg570 View Post
Had these fitted today. $230/rim, $395/corner for D 967's and under a $100 for 4 TPMS sensors delivered to the door. Trip to Flinders Ranges next week, didn't want to risk the 20"/Khumos in some of those rock strewn creeks and hill climbs. Hardly notice any increase in tyre noise at highway speeds. TPMS picked up in Uconnect as soon as some k's done, no 're-programming' required as suggested by a couple of dealers. [/url][/IMG] [/url] [/url] [/url]
They look good. What did you do about the spare? An aside: what are the roof bars and how is the wind noise?
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Old 03-28-2014, 06:44 AM
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Re: Off Road 18"s

I have kept the 'original' steel 18" rim and Khumo (245/65/R18) for the time being. Must admit I was a little surprised when I first discovered the steel 18" rim in the back instead of a 20" alloy!

Will probably end up getting a 5th D697 and steel rim for extended trips.

Thule WingBar Edge. Yes, you can definitely hear them at highway speeds, but not to the point of annoyance or distraction. I put them on pretty well as soon as I got the JGC, so I can't really remember what the drive was like without them. Probably the quietest bars I have had though.
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  #81  
Old 03-28-2014, 08:52 AM
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Re: Off Road 18"s

love to hear some feedback on the d697s.. the reviews seem to range from great to poor !
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Old 03-29-2014, 04:58 AM
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Re: Off Road 18"s

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Originally Posted by Berg570 View Post
I have kept the 'original' steel 18" rim and Khumo (245/65/R18) for the time being. Must admit I was a little surprised when I first discovered the steel 18" rim in the back instead of a 20" alloy!

Will probably end up getting a 5th D697 and steel rim for extended trips.

Thule WingBar Edge. Yes, you can definitely hear them at highway speeds, but not to the point of annoyance or distraction. I put them on pretty well as soon as I got the JGC, so I can't really remember what the drive was like without them. Probably the quietest bars I have had though.
I got another alloy for the spare so I can do a 5 wheel rotation. Actually I've got identical alloys on the trailer, two running one spare. Both car and trailer are shod with D697's so I do an 8 wheel rotation... it's a lot of work.

Your wheels look great! What are they? For God's sake don't scratch them up the Ranges.

I can hear the D697's on the highway but what the hell, it's a diesel fourbie with LT tyres, not a Barina.
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  #83  
Old 03-29-2014, 05:27 AM
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Re: Off Road 18"s

Where have you guys been getting your 2nd set of TPMS sensors from, and more specifically, which ones fit OEM Jeep wheels?

Cheers,
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Old 03-29-2014, 05:28 AM
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Re: Off Road 18"s

Wheel Man on eBay.

Tyre Pressure Monitoring System part number is 56029398AB

http://pages.ebay.com/motors/link/?n...d=121047275737

Cheers,
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