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My guess is that all the tyres are same out of the factory (not so far from where I live here in Thailand) and have been rated differently for whatever reasons.

This is from the manufacturer's website:

IMG_2073.PNG

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The big question is whether to run the 140/80 or the 150/70? The 150/70 tires nearly double in price. While having a conversation with the Dunlop guy, he made a good point about 150/70 vs 140/80 on a 4.15 rear wheel. He said, "not all 150/70 tires are actually 150/70, there are plenty of 150/70's that measure 140/80..." I know that to be true in the world of truck tires, his statement would suggest that what a tire measures, and what it is labeled as are two separate things.

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Never looked at the price, but valid point. 

With my off road focus there's also good reason to run a slimmer tyre.

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Looking at speed ratings for the 140/80 I'll be going with the 150/70 as it's another R rating the same as the front.

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I've bee doing some reading about car tire speed ratings, in general this is good to know. 

Essentially, the speed rating of a car tire is based on the lateral flex of the side wall. The amount of flex in the side wall is what allows the tire to respond to steering input. The higher the speed rating, the thicker the side wall, as the side wall gets thicker it flexs less, thus tire responds quicker to be being steered. These factors are multiplied the higher the speed. 

This information applies to car tires, but I couldn't find anything saying that it was car tires only, or only applicable to automotive tires. 

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It's not a road biased tyre for sure. A friend had it on his AT too and complained the windshield would vibrate at low speeds because of the tread. I've only ever ridden on knobblies so don't notice anything.

I had the Tractionator Adventure on before and that howled at speeds. The centre strip of the GPS keeps both the noise and road manners of this tyre, if you pardon the pun, in line...

Edited by Craig S
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I've got the Tract. Adv front on my 990 , but running the psi only between 24-28 .

Knowing what this tire is meant for , I'm not pushing it on pavement at these pressures , it seems plenty firm enough and ready for off-road without really airing down. YMMV

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Initial ride across town impression is that they roll with much less resistance than kenda big blocks. Also the extra meat on them makes It harder to flat foot at a stop and the side stand has a noticably bigger lean.

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I have a ride coming up, Just ordered some new tires from Slaven's. Going to try the Golden Tyre 90/100 Fatty front, and a Motoz Tractionator Desert H/T for the rear. For the mixed riding I'm going to keep a set of Shinko's on hand, still sorting out what I need for the long dirt rides. 

Fatty Review

 

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