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  #121  
Old 12-21-2013, 06:03 AM
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Re: 20" Tyre Thread

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Originally Posted by jefferson.oz View Post
Just a note on different tyre diameters and speedo error, when I changed tyre's my speedo seemed pretty much right, just thought I was lucky, but found out from the Jeep guru I go to they have a list of several different tyre diameters they can load to correct the speedo or at least get it close.... Clever huh!
Indeed that is clever and this also answers my question about how the Tire Pressure Sensor adjusts to larger tires I'm guessing. I was a little displeased at the flashing display when I took my recent test drive. The tires required a little air but the Jeep had also been setting in freezing temps so the tires had to warm up I guess to register correctly.
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  #122  
Old 01-01-2014, 07:01 PM
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Re: 20" Tyre Thread

Gave the Terra Grapplers a work out this week including various 4wd configurations at Mt Mee north of Brizzy. Downhill descent is a great feature and whilst I only went "moderate" due to having steps and not removing the airdam, it was challenging enough and the tyres and car performance was brilliant. Not going to clean it as I like the tough new look!!
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  #123  
Old 01-18-2014, 03:55 AM
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Re: 20" Tyre Thread

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Originally Posted by BobT View Post
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.
Thanks for the info I am trying to sort out what tyre to purchase and your posted message have been a help tangles 17
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  #124  
Old 03-06-2014, 07:00 AM
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Re: 20" Tyre Thread

Well, well,well maybe the rumors may be true, just got my Jeep serviced and their telling me all four of my Cooper LTZ's have cracked sidewalls on the inside, got 80,000km on them now but only about half worn, always been at 40 Psi.... I kinda reckon the sidewalls should last at least as long as the tread, always seem to on every other tyre I've ever brought.... Now what do I put on it?
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  #125  
Old 03-06-2014, 07:53 AM
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Re: 20" Tyre Thread

At the risk of being considered the odd one out here, I finally replaced the OEM Kumhos KL21's after 65,000km.

I replaced them with the Kumho Crugen KL33's. The main reason was that I was not satisfied with other options on the market when the main requirement is a quiet (and comfortable) ride.

$399ea.
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  #126  
Old 03-06-2014, 04:25 PM
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About to replace the fronts only of my cooper at3. The left front has worn on the outside shoulder at 40,000k. I've had them aligned twice but the left has never seem right. I'm going to change them now as the right front is still good, so ill use that as the spare.
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  #127  
Old 03-06-2014, 05:42 PM
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How often do you guys rotate your tyres? If serviced at a Dealer they are supposed to do it every service, but I suspect that many don't. I always rotate ours every 10,000k.
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  #128  
Old 03-06-2014, 07:07 PM
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The dealer I use rotates, so every 10k
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  #129  
Old 04-03-2014, 03:39 AM
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Re: 20" Tyre Thread

Bit of a thread revival.

Has anyone fitted 275/45 x 20's to their Jeep?
There's a fair bit more to choose from in that size and the change in rolling diameter is around 2% slower.

Thoughts?

Matty
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  #130  
Old 05-21-2014, 06:53 PM
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Re: 20" Tyre Thread

Found a split in the sidewall of one of my rear tyres. It is near the rim, and appears to have been done by a knife or blade ! It's about 20mm long, and no abrasions near it.
These are still the original Kumhos and my rears have the most tread, which currently have done 28,000 klms and still looking reasonable. The fronts maybe have another 10,000klms left on them.
Have decided to go for 4 Cooper Zeon LTZ 285/50/20.
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  #131  
Old 05-22-2014, 05:57 AM
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Re: 20" Tyre Thread

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Originally Posted by allypally View Post
Found a split in the sidewall of one of my rear tyres. It is near the rim, and appears to have been done by a knife or blade ! It's about 20mm long, and no abrasions near it.
These are still the original Kumhos and my rears have the most tread, which currently have done 28,000 klms and still looking reasonable. The fronts maybe have another 10,000klms left on them.
Have decided to go for 4 Cooper Zeon LTZ 285/50/20.
Thats what I am looking at when I replace my kumhos, which will probably be soon. Be interested in how you go with them etc. Bugger about the split.
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  #132  
Old 05-22-2014, 07:52 PM
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Re: 20" Tyre Thread

Quote:
Originally Posted by allypally View Post
Found a split in the sidewall of one of my rear tyres. It is near the rim, and appears to have been done by a knife or blade ! It's about 20mm long, and no abrasions near it.
These are still the original Kumhos and my rears have the most tread, which currently have done 28,000 klms and still looking reasonable. The fronts maybe have another 10,000klms left on them.
Have decided to go for 4 Cooper Zeon LTZ 285/50/20.
Being a Kumho, I'd be surprised if it was anything other than a flexural split. The Kumho KL21 is an eco tyre so uses soft low hysteresis rubber to reduce rolling resistance. Their add says it all, "Developed using nature-friendly rubber, filler oil and other environmental elements...". Hardly an endorsement of toughness.
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