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  #109  
Old 12-11-2013, 05:44 AM
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Re: 20" Tyre Thread

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Originally Posted by wabat View Post
Glenn,

Yes, solid side facing out. I made the mistake of having the stripe side facing out and I think it's harder to keep clean.

BTW, I thought our Jeeps are speed limited to 185kmph? Can someone confirm this?
255kph on the SRT
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  #110  
Old 12-12-2013, 05:51 AM
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Re: 20" Tyre Thread

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Originally Posted by GlennR View Post
Just noticed the speed rating on my Nitto's is "S" meaning I'm somewhat limited above 180kmh. Better watch the speedo from now on. Load rating is 111 which is greater than the stock Khumo's. Not sure if this qualifies as an LT tyre?
My Bridgestone D697s are LTs with a rating of 110S. This is near enough to yours so maybe they are LT but it should say so clearly on the sidewall.

Ironically the LT (Light Truck) designation does not relate to load rating. A passenger tyre is constructed in such a way as to make it relatively squishy and balloon like, ideal for comfort in low centre of gravity passenger vehicles. On a high centre of gravity commercial vehicle, such a tyre could produce dangerously high body roll. A more stable tyre is needed. A squarer cross-section is used with thicker rubber and more plies. Next time you drive side by side to a truck, look at the tyres and see if you can see any load deformation. You won't see much. A side benefit of LT construction is that the tyre becomes less vulnerable to punctures in both the tread and sidewall, therefore ideal for off-road. A disadvantage of all that rubber is that heat builds up quicker and dissipates slower. For this reason LT tyres have lower speed ratings AND lower load ratings. Yes, you read right. For a given tyre pressure, a passenger tyre has a higher load rating than an LT tyre. However, because of the tough construction, an LT tyre can withstand higher tyre pressures and therefore able to carry heavier loads. To reiterate, the purpose of LT construction is stability under load, the purpose of passenger construction is comfort.
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  #111  
Old 12-12-2013, 03:48 PM
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Good write up. Cheers Bob.
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  #112  
Old 12-12-2013, 08:10 PM
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Re: 20" Tyre Thread

20" Nitto Terra Grapplers fitted today.

First Impressions : -

  • They look GREAT. Have certainly added a bit of testosterone to the appearance. Jeep looks like it could climb the north face of Mt Everest!
  • Immediate improvement on-road grip!
  • Noisy! A bit surprising based on reviews of this tyre. More noticable "roar" up to 80kmh, then gets lost with wind noise thereafter. The TPMS is showing 3bar that I think is high. (42psi). The tyres are rated to a max of 50psi, but I wonder if high tyre pressure might add to the noise?. (ie they are not running flat)
  • An alignment was carried out after the tyre change, with significant adjustment to the toe angle. Interestingly, the report shows the caster is way out but cannot be adjusted. But here's the question, as I jumped in the car, the suspension was set accidentally or otherwise to ORI. If the alignment was done at this height, could the report be incorrect....ie does the set up change as the car is raised and lowered?
Anyhow, I'm going to drop a few PSI on the way home and see if the noise quietens down.
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  #113  
Old 12-13-2013, 05:07 AM
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Re: 20" Tyre Thread

Glenn,

I originally had mine at 40psi. The ride was harsh and it was abit noisey.
I've since reduced it to 36psi and the ride is alot more comfortable.
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  #114  
Old 12-13-2013, 06:15 AM
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Re: 20" Tyre Thread

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Originally Posted by wabat View Post
Glenn,

I originally had mine at 40psi. The ride was harsh and it was abit noisey.
I've since reduced it to 36psi and the ride is alot more comfortable.
Did yours quieten down after a few 100kms? I dropped my pressure down to 36psi and the noise increased. I put a bit more air in (39psi) that seems to have quietened them down somewhat...seems to be a happy medium however I have only done 30kms on them. Apart from the noise...and maybe I am being a little sensitive in this area..(its really only just a mild hum, pretty good for a chunky AT)....I am wrapped with the transformation.
She's lost the "soft roader" look and her...sorry his balls have eventually dropped!!
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  #115  
Old 12-13-2013, 06:51 AM
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Re: 20" Tyre Thread

Quote:
Originally Posted by GlennR View Post
If the alignment was done at this height, could the report be incorrect....ie does the set up change as the car is raised and lowered?Anyhow, I'm going to drop a few PSI on the way home and see if the noise quietens down.
The height definitely affects the geometry but whether it's significant enough, I can't say. Put your car in Sport Mode and park it on a flat surface. Get the missus to raise it to ORII and down again while you watch the tyres from outside. You will see them squirm a bit as they adjust to differing geometry. Anyway, I wouldn't leave it too long for another wheel alignment. Off hand, I don't know what the manual says but I would guess it stipulates a specific height at which the alignment specifications are to apply.
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  #116  
Old 12-13-2013, 07:42 AM
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Re: 20" Tyre Thread

Quote:
Originally Posted by GlennR View Post
Did yours quieten down after a few 100kms? I dropped my pressure down to 36psi and the noise increased. I put a bit more air in (39psi) that seems to have quietened them down somewhat...seems to be a happy medium however I have only done 30kms on them. Apart from the noise...and maybe I am being a little sensitive in this area..(its really only just a mild hum, pretty good for a chunky AT)....I am wrapped with the transformation.
She's lost the "soft roader" look and her...sorry his balls have eventually dropped!!
Mine did quieten down after a few hundred kms, however the mild hum will still be there compared to the Kumhos.
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  #117  
Old 12-19-2013, 05:55 AM
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Managed to squeeze 40k out of the OEM Kuhmos. Changing them tomorrow for the Xeon LTZs. I got them for $345 each fitted.
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  #118  
Old 12-19-2013, 09:05 AM
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Re: 20" Tyre Thread

Our OEM Kumhos have done 60k but are getting close. So I haven't been totally unhappy with Kumhos. (BTW the Jeep is predominately my wives drive, may partly explain the extended tyre life as she really does baby the thing).

For me, a quiet ride is most important so will likely opt for something only slightly different, being the Kumhos Crugen KL33s.

Time will tell.
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  #119  
Old 12-20-2013, 04:50 AM
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Initial impressions of the Xeon LTZs after a hundred km:

They certainly feel better than the OEM Kuhmos. The ride is noticeably smoother, particularly over speed humps and corrugations.

The steering is slightly heavier, but I think the handling is improved.

The extra height is noticeable from the inside and out. I like it

I don't notice any extra noise as I generally drive with the windows up and air on. If the tyre noise becomes noticeable I don't see the problem, just turn up the radio.

They do enhance the look of the car. I think they are more in proportion than the OEM tyres.

What does everyone else run their LTZs at? The tyre shop inflated them to 46 psi front and 42 psi rear. I rang them to query this and they recommended 42 psi all around and increase the rear to 46 psi when towing. The guy at the tyre shop reckons you can run them up to 60 psi!!! WTF? The invoice recommends rotation, alignment, balance every 5000km. Is this a Cooper thing? I would have thought every 10,000 km is sufficient.
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  #120  
Old 12-21-2013, 05:35 AM
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Re: 20" Tyre Thread

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Originally Posted by selous View Post
The guy at the tyre shop reckons you can run them up to 60 psi!!! WTF?
That's about right. This is why LT tyres can take higher loads. You can find the max. allowable inflation pressure marked on the side wall. My Bridgestone D697s go to 65psi. Assuming your tyres are LT275/55R20, according to the Tyre and Rim Association Manual, at 60psi your tyres should be able to take a load of about 1,120kg, that is 2,240kg per axle. Unfortunately the Jeep's suspension will take only 1,452kg per axles (65%). This might seem a waste but it's testament to the toughness of the tyre which is exactly why LTs are favoured off road.

Quote:
Originally Posted by selous View Post
The invoice recommends rotation, alignment, balance every 5000km. Is this a Cooper thing? I would have thought every 10,000 km is sufficient.
That's pretty normal these days, see http://www.tirerack.com/tires/tirete....jsp?techid=43 . Once upon a time it was all about getting the tyres to wear out about the same time. Now it's more about keeping the diameter of each tyre about the same so as not to confuse the poor little computer.
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