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Discussion Starter #1 (Edited)
Backstory: I am reviewing the newly designed Kumho AT51 All Terrain tires (Example: ONE ). I specifically have the Light Truck (LT) 285/75-16 size. For a general overview of the tires, I choose them for one main reason, that is that even in the LT trim, the tires come with a 55,000 mile warranty. In all the research that I have done with deciding new tires for my Xterra, a millage warranty was very important to me. I had not come across ANY tire brand that offered the LT tire with a millage warranty, until, I came across the Kumho AT51’s. I put the AT51’s aside as the top spot and searched for a cheaper tire. Always being a thrifty shopper, I am never pleased with the first “Good Deal” that I fine. While the AT51’s were a great price at ≈160$ I was still not pleased. I searched online, found some other brands that were cheaper, but at what cost? The more and more I looked that more and more I kept thinking about the AT51’s with the great price and warranty. So for the warranty and the price alone. As I said before, the tires are a new design and there were NO reviews that I could find online that worth anything. So I decided to get them and write a review of the tires.

On Road: I have had the tires for ≈2,000miles now, and am so far pleased with the tires. First I will tell you my impressions of the the tires one the road. Being that I choose a LT trim tire that has 10ply rating, I was expecting a much rougher ride. I once owned a Land Rover Discovery that I put 10ply Maxxis Bighorns on. That dramatically changed the quality of the ride. Even with the Discovery’s super soft ride, I could tell the difference with the Bighorns. That being said, I did not have high hopes with the AT51’s for my daily driving. Yes, my Xterra spends 90% of its life on the pavement, and for that reason I choose a All Terrain tire. At the end of the day, I still needed it to be able to dive “well” on the road. The stock BFG Radial Long Trails were smooth and only produced and average of 72db on concrete highway. When I did the same test on the AT51’s on the same two mile section of highway, the AT51’s produced only 74db. The tires do not have a very noticeable drone. There is a drone but I can only hear it when the radio is not on and the windows are closed, yes closed. If there is any sort of exterior noise, the tire drone is drowned out. Within that 2,000 miles, I have taken two trips up to Asheville, NC. One when it was raining the whole time and once when it was dry as a bone. Both times the Xterra felt secure and attached to the road, I will attribute this to the large number of sipes. There is a noticeable increase in spray that comes off the tires in the rain. The tires are asymmetrical so there is no need to install them in a certain direction and a traditional X pattern rotating of the tires will be fine. If you are OCD like me, you may not like that the side wall pattern favors a direction and one side will always be rotation the wrong way (Example: TWO )

Off Road: Coming from Maxxis Bighorns, I had a good sense of what great traction feel like. The Kumho AT51’s surprised me a lot off road. Even though they are not the most aggressive all terrain, they perform great in a lot of conditions. The only issue that I personally found with the tires is that they don't bite quite as well on rocky conditions. Even with the tires down to 18psi, there were some times with the tires didn't make great contact in muddy or rocky conditions. Also after doing some heavy wheeling, I found that there was small, very small chipping on some of the hard edges of the nubs (Example: THREE ). Not a lot, maybe four or five places.

Overall I would definitely recommend the tires to anyone looking for a 50/50 tire for both on road and off. Great price, great performance and great warranty.

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Nice review. I am guessing those tires are E load? How is the ride comfort compared to the Long Trails on road and what tire pressure are you running?

I ran BFG AT KO in E load and really did not like to ride. I ended up replacing them few months ago with P rated AT51.
 

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Discussion Starter #3
The are E Load. They ride quite nice compared to the Maxxis. They are a little rougher than the Long Trails but not unbearable or that noticeable.
 

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Discussion Starter #6 (Edited)
Here how the tires look after 57k on them. There are some cracking and chips. They have alot of highway and forest road miles on them.


I tracked all my MPGs and services on Fuelly:
33's 285-75r16 15 city, 17 highway, 16 combined, 275 miles per tank
30.6 265 70r16 17 city, 20 highway, 18.5 combined, 380 miels per tank

I am looking into some 245 75r16 after this. A stockish skinny tire. I am doing alot more highway driving these days and need the fuel economy back. Mostly so I can get close to 380 miles on a tank rather than 275. It sucks stoping all the time. I still have a bit of time, its just whats on my mind.

I am running 3.133 stock gears. And I will say the tranny hunts for gears alot more with the larger tire. I am not planning on regearing any time soon so going back to a 31 from a 33 will be nice. Also, I am towing alot more these days and the extra torque will also be nice to have back.

FYI the tires are a little over inflated right now as I just came back from Discount Tires for a flat repair. They inflated them to 40 psi for some reason.... I have a total of 6 patches on all of the tires from screws and nails I have hit.
 

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Here how the tires look after 57k on them. There are some cracking and chips. They have alot of highway and forest road miles on them.


I tracked all my MPGs and services on Fuelly:
33's 285-75r16 15 city, 17 highway, 16 combined, 275 miles per tank
30.6 265 70r16 17 city, 20 highway, 18.5 combined, 380 miels per tank

I am looking into some 245 75r16 after this. A stockish skinny tire. I am doing alot more highway driving these days and need the fuel economy back. Mostly so I can get close to 380 miles on a tank rather than 275. It sucks stoping all the time. I still have a bit of time, its just whats on my mind.

I am running 3.133 stock gears. And I will say the tranny hunts for gears alot more with the larger tire. I am not planning on regearing any time soon so going back to a 31 from a 33 will be nice. Also, I am towing alot more these days and the extra torque will also be nice to have back.

FYI the tires are a little over inflated right now as I just came back from Discount Tires for a flat repair. They inflated them to 40 psi for some reason.... I have a total of 6 patches on all of the tires from screws and nails I have hit.
Thanks for posting the review, and more importantly the follow up after long term use!

I have never used fuelly so I have what could be a dumb question. Do the MPG calculations account for the odometer error caused by having the larger tires? In other words is the 275 miles "per tank" actually 275 miles the vehicle travels, or 275 miles per the odometer?
 

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Discussion Starter #8
It goes off of the odometer. So there are some discrepancies with the true mileage. According to the tire size calculator, there is about a 7.2% difference between the two tire sizes.
 

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I'm at about 30k on my AT-51s, and I couldn't be happier. I first got a set on my Ranger, so when I got the X, and it needed tires, I knew what I was getting. Traction has been great everywhere, even in some pretty good snow up HWY 395 heading to Tahoe. Only issue I have had is the chunking on the knobs right on the edge of the tire, but that was worse on my Ranger than the Xterra.
 

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Discussion Starter #10
I'm at about 30k on my AT-51s, and I couldn't be happier. I first got a set on my Ranger, so when I got the X, and it needed tires, I knew what I was getting. Traction has been great everywhere, even in some pretty good snow up HWY 395 heading to Tahoe. Only issue I have had is the chunking on the knobs right on the edge of the tire, but that was worse on my Ranger than the Xterra.
I do have a few large chunks taken out of the knobs as well.
 
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