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  #25  
Old 09-24-2013, 06:41 AM
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Re: Off Road 18"s

Reading the latest TSB sheet (Sept 18), there is an issue for another region (supposedly not relevant to us?) about a tyre problem with the oem Khumo 265/60/18 A/T's. Amongst other things, it says that if the tyres are replaced by the lower speed rate Michelins (190km/h vs 209 km/hr), then "it is required the control module be replaced and flashed with a lower speed rated software".
It would seem then, that if I replace the khumo's whit D697's (180km/hr), then I may need the control module replaced and flashed.
Does anyone know what this flash does? And why it would be a module REPLACEMENT as well? I would guess it is only for something like the speed limiter, but maybe it also impacts other functions I can only imagine.
Thanks,
Russell
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Old 09-24-2013, 08:03 AM
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Re: Off Road 18"s

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Originally Posted by lt4vette View Post
Reading the latest TSB sheet (Sept 18)...
Russell
You're hitting the reading pretty hard Russell! Good stuff mate, and respect.

My understanding is that this currently isn't so much an issue here, though I'm in WA and legislation will be different between the States. In WA, 4WDs have been issued scope to fit lower speed rated tyres, provided the vehicle does not exceed those speeds. I recall most states had provisions that were much the same... though things change. It was some time ago since I was across this topic.

I hope in the drafting of the new National code for vehicle modifications they take a common sense approach to this topic.... after all, the speed limit is 110km/h after all!

One thing is for sure, and that is insurers don't so much care. Unless there's a Police report stating tyre failure was an issue no one is going to even think about knocking back your claim. Besides, it's arguable in court... they just couldn't be bothered.

The uncertainty in the modifications arena makes product selection awkward. Just how much offset can I change, how far up in diameter can I go and how much wider??? Speed rating reduction fits into this exact same basket, and until the authorities give us clear direction we're left juggling.

All that said, I don't think that in any time soon my dealer is going to insist they flash my Jeep because I've rolled in on nasty N rated muds! Remember these are the guys trying to deliver cars in the wrong colour!

Steve
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  #27  
Old 09-24-2013, 01:38 PM
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Re: Off Road 18"s

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Originally Posted by Barboots View Post
You're hitting the reading pretty hard Russell! Good stuff mate, and respect.

My understanding is that this currently isn't so much an issue here, though I'm in WA and legislation will be different between the States. In WA, 4WDs have been issued scope to fit lower speed rated tyres, provided the vehicle does not exceed those speeds. I recall most states had provisions that were much the same... though things change. It was some time ago since I was across this topic.

I hope in the drafting of the new National code for vehicle modifications they take a common sense approach to this topic.... after all, the speed limit is 110km/h after all!

One thing is for sure, and that is insurers don't so much care. Unless there's a Police report stating tyre failure was an issue no one is going to even think about knocking back your claim. Besides, it's arguable in court... they just couldn't be bothered.

The uncertainty in the modifications arena makes product selection awkward. Just how much offset can I change, how far up in diameter can I go and how much wider??? Speed rating reduction fits into this exact same basket, and until the authorities give us clear direction we're left juggling.

All that said, I don't think that in any time soon my dealer is going to insist they flash my Jeep because I've rolled in on nasty N rated muds! Remember these are the guys trying to deliver cars in the wrong colour!

Steve
Thanks Steve. Certainly if it is only the speed limiter, then I agree - its not an issue (it may be in the Emirates which is the affected region on the TSB). And I can't think of anything else it could be. I can't imagine it could affect say, the stability control. Maybe the maximum speedo reading? But the replacement of the control module puzzles me - surely the speed limiter would be simply reprogramming.
Anyway, I get mine at lunchtime today, and heading out west on a "shakedown" run.
Thanks,
Russell
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  #28  
Old 09-25-2013, 03:47 PM
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Re: Off Road 18"s

Quote:
Originally Posted by lt4vette View Post
Reading the latest TSB sheet (Sept 18), there is an issue for another region (supposedly not relevant to us?) about a tyre problem with the oem Khumo 265/60/18 A/T's. Amongst other things, it says that if the tyres are replaced by the lower speed rate Michelins (190km/h vs 209 km/hr), then "it is required the control module be replaced and flashed with a lower speed rated software".
It would seem then, that if I replace the khumo's whit D697's (180km/hr), then I may need the control module replaced and flashed.
Does anyone know what this flash does? And why it would be a module REPLACEMENT as well? I would guess it is only for something like the speed limiter, but maybe it also impacts other functions I can only imagine.
Thanks,
Russell
Good spotting! If this is perhaps a speed warning indicator then if Jeep changed the tyres, it would be an insurance issue for them. If we change the tyres, we take the risk. I don't intend to go anywhere near 180kph on the D697's or anything else so not an issue for me.
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  #29  
Old 10-11-2013, 06:06 PM
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What's the largest tyre size that will fit on the 18" OEM rims with Quadra Lift? I thought I read somewhere that it was 265/65/R18 but haven't been able to find it again.
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Old 10-11-2013, 06:16 PM
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Re: Off Road 18"s

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Originally Posted by DS84 View Post
What's the largest tyre size that will fit on the 18" OEM rims with Quadra Lift? I thought I read somewhere that it was 265/65/R18 but haven't been able to find it again.
275/65R18 fit without grief though the spare wheel well will protest a little, especially if they have a square shoulder.

From there up it could require an offset change, and the guard liners would be "very close"

Cheers,
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  #31  
Old 10-12-2013, 01:05 AM
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Re: Off Road 18"s

Quote:
Originally Posted by DS84 View Post
What's the largest tyre size that will fit on the 18" OEM rims with Quadra Lift? I thought I read somewhere that it was 265/65/R18 but haven't been able to find it again.
I recall reading someone having fitted BFG T/A KO's in LT265/65R18. After a long trip, there was some scuffing of the guard liner but otherwise they worked fine. This turned me off the BFG's but it might not be an issue for you.
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  #32  
Old 10-19-2013, 07:43 AM
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Re: Off Road 18"s

I just replaced my OE Kumho 20's with some Pirelli Scorpion ATR 265/60R18's fitted to OE 18's. They look great... I have noticed they're a little noisier than the OE Kumho's (to be expected) but I really need to turn the music off to notice... I will have to take them for a decent run and let you know my thoughts otherwise.
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  #33  
Old 10-19-2013, 09:53 AM
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Re: Off Road 18"s

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Originally Posted by exlr8 View Post
I just replaced my OE Kumho 20's with some Pirelli Scorpion ATR 265/60R18's fitted to OE 18's. They look great... I have noticed they're a little noisier than the OE Kumho's (to be expected) but I really need to turn the music off to notice... I will have to take them for a decent run and let you know my thoughts otherwise.
Did you buy these Pirelli locally?
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  #34  
Old 10-20-2013, 06:26 AM
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Yes, just at Jax Bowen Hills. They had to order them which took a few days so I am sure any local store could source them. Happy with them so far...
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  #35  
Old 11-11-2013, 06:49 PM
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Re: Off Road 18"s

I have just put together a set of 18" rims for my GC to compliment the 20's I usually run, after picking up a set of Laredo rims of ebay I painted them gloss black to match the Jet edition theme. Then after plenty of research I went with some Hercules Terra Trac tyres in 265/60/18 these are made in the US and at $220 each fitted and balanced are a bargain, considering they will sit in the shed probably 8 months of the year. Being the same rolling diameter as the 265/50/20's meant that the spare also fits in its spot with all the storage bins.
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  #36  
Old 11-11-2013, 08:05 PM
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Re: Off Road 18"s

Good find Adam... they look like they'll do the job I love the price!

What's the data on them. Physical construction, load / ply rating, speed index, etc?

Ciao,
Steve
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