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It might be a bad tire. Sometimes it happens.

Does the vibration go away when the tires are rotated to the rear? Have the tires been remounted or just rebalanced?
 

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Just had it back in today. I think they rotated front to back, and rebalanced the fronts. The vibration has gotten much better, but still there at 60-65, then worse at 70-80. But more comfortable to drive at least for now.
Guy said to bring it back monday so they can "play with it". He said they're going to need two hours to look everything through, inspect the wheels and all that.
Will be the 4th trip now. But really trying to avoid taking it to another shop, as I dont know of any reputable that could for sure fix the problem with one trip.
 

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Discussion Starter #23
Just had it back in today. I think they rotated front to back, and rebalanced the fronts. The vibration has gotten much better, but still there at 60-65, then worse at 70-80. But more comfortable to drive at least for now.
Guy said to bring it back monday so they can "play with it". He said they're going to need two hours to look everything through, inspect the wheels and all that.
Will be the 4th trip now. But really trying to avoid taking it to another shop, as I dont know of any reputable that could for sure fix the problem with one trip.
Like Mr. Bills said, it could just be a bad set of tires? :dontknow:
If they can't solve it on Monday, just tell them to contact Cooper and get a new set (shouldn't cost you anything). Cooper also has their 45 day drive test.
 

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Was back in today. Still slight vibration. Not sure this shop really knows what they're doing, so Im done with them. I went to pepboys and the guy said the previous shop did a static balance, where he would recommend a dynamic balance instead. But I dont want to take it back to the old place, because I have no confidence in them at all. I'm going to my mechanic tomorrow for something unrelated, but will ask him about a recommendation.

Any thoughts on static vs dynamic? I didnt know this was a thing until today.
 

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Was back in today. Still slight vibration. Not sure this shop really knows what they're doing, so Im done with them. I went to pepboys and the guy said the previous shop did a static balance, where he would recommend a dynamic balance instead. But I dont want to take it back to the old place, because I have no confidence in them at all. I'm going to my mechanic tomorrow for something unrelated, but will ask him about a recommendation.

Any thoughts on static vs dynamic? I didnt know this was a thing until today.
You said you had a road force balance. That's about the best you can do as long as it's done right. I hate to send you down another path but have you done u joints? I didn't even notice the vibration from mine until I got new tires. They kept telling me the same thing...rotate and balance 3x, bad tire, maybe a bent rim, bad rotors....no it was front u-joints. They did the rear because it was loose, but said the front were fine. When I got under there the front were tight but I could tell they were shot. Replaced them and smooth as butter. Just a thought.
 

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Discussion Starter #26
Was back in today. Still slight vibration. Not sure this shop really knows what they're doing, so Im done with them. I went to pepboys and the guy said the previous shop did a static balance, where he would recommend a dynamic balance instead. But I dont want to take it back to the old place, because I have no confidence in them at all. I'm going to my mechanic tomorrow for something unrelated, but will ask him about a recommendation.

Any thoughts on static vs dynamic? I didnt know this was a thing until today.
Do you have a Costco membership? Even if you didn't buy the tires from them you can get them balanced and rotated for about $22 for all 4 tires. Yes, it's that cheap; but you'll end up leaving the warehouse with an additional $100 worth of stuff, hahaha.
 

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jcco - I'll have my mechanic out the u-joints next week.

Messe - I don't have a costco membership, and I hadn't realize they do tires. What don't they sell?? Something to consider though, thanks.

I went to a seemingly more reputable shop, they rebalanced them, and the ride is much better than it was. But, still not as good as it was on my old bf goodrich tires. So i'm assuming at this point the remaining gripes I have are with the actual tire and how it rides. Maybe I chose the wrong tire? I'm going to put 2k+ miles on them in two weeks, including plenty of off-pavement Utah mileage. So I'll see how they hold up.

Any other things to look at in regards to ride quality? Could a tired suspension cause lots of little vibrations and whatnot? I wouldnt know where to begin with that, outside of u-joint as jcco stated. Although, I didnt experience this with the old tires. Just trying to get that cadillac ride thats off-road capable lol.
 

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Discussion Starter #28
jcco - I'll have my mechanic out the u-joints next week.

Messe - I don't have a costco membership, and I hadn't realize they do tires. What don't they sell?? Something to consider though, thanks.

I went to a seemingly more reputable shop, they rebalanced them, and the ride is much better than it was. But, still not as good as it was on my old bf goodrich tires. So i'm assuming at this point the remaining gripes I have are with the actual tire and how it rides. Maybe I chose the wrong tire? I'm going to put 2k+ miles on them in two weeks, including plenty of off-pavement Utah mileage. So I'll see how they hold up.

Any other things to look at in regards to ride quality? Could a tired suspension cause lots of little vibrations and whatnot? I wouldnt know where to begin with that, outside of u-joint as jcco stated. Although, I didnt experience this with the old tires. Just trying to get that cadillac ride thats off-road capable lol.
I know that you can also buy cars from them, as well as coffins (at least you don't have to buy a 2 pack! :rolf: )

In my experience, I haven't seen tired suspension cause this type of issue. Worn out hub bearings or a bent rim is a possibility. But if you didn't have this issue with the old BF tires then that is most likely not the problem. I would venture to guess that you just ended up with a bad batch of tires and Cooper would replace them under warranty. I know it's a pain but a lot easier than trying to chase your tail...
 

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Just put 2k+ miles on these from LA area to Moab, UT and back. MOstly highway of course, but plenty of dirt roads and one "off-road" trail, called Long Canyon Trail.

I took it from the bottom up and had no issues with the tires. Road was rocky from recent rain, and Pucker Pass was very rocky. No slippage aside from at P.P. due to deep, fine sand against the bedrock and my lack of ability as a rookie.

Overall the tires performed well, on road and off. They seem to be very sensitive to every road condition, which is good and bad. A few mornings when we hopped on the highway, my truck would pull a lot left or right for awhile, then it seemed to go away. ONly thing I can think is that they do retain a lot of stones, and possibly that weight affects how the tire tracks. But this is just a theory based on zero knowledge or experience that I hold of AT tires, offroading, etc. I worry a lot so this is my explanation.

I also have two small..I can't explain it...small dips or grooves on the ride side tires. I'm guessing I damaged the tire somehow, and broke something inside. They run the same still, no issues at all. But it's concerning, considering I ghave about 3k miles on them only.

I'm hoping it's not a safety issue. I honestly don't know anything about this.

These are P rated, and I'm thinking they're just thin and not robust enough for heavy usage. I'd like something with more protection, without sacrificing mpg or ride quality, but dont know if moving to LT tires next time would be a good trade off in that regard. Again, I know very little about tires and driving off-pavement.

Overall, they performed well in all conditions. THey retain a lot of stones, sometimes pull left or right for me after long days off pavement. (had alignment done before trip), vibrate depending on paved road surface, but got 20+mph highway, and let me go where I wanted without issue.
 

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Tires pulling when they didn't before indicates the belts have come loose and are shifting. Especially when the pull changes from left and then right. Seems the level of off road use you gave them indicates you need LT tires which have heavier/more belts. Going from P to LT you do sacrifice ride for toughness, no way around it.
 

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jschaf, did you get you vibration figured out, as well as that slight pull that you would sometimes feel? What inflation pressure are you running? Are you using stock wheels?
 

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I installed my AT3 4s' last week and have loved the ride. About an inch taller than the same size tire in the Cooper HTPs (which lasted 71k).
Bump steer has been tamed some which is good, no loss in fuel mileage, and they look awesome!
 

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I have a set of Cooper Discoverer AT3 LT tires, LT265/75R16-C, installed 8/26/2019 that now have just over 6,000 miles on them, 4,200 miles of which were on a 3+ week overlanding trip to Cabo San Lucas and back with road conditions known for eating tires. They replaced a set of Cooper Discoverer ST/Maxx tires, LT265/75R16-E, that gave me 40,000 miles of trouble free service.

I have nothing but good things to say about my Cooper AT3 LT tires and the heavier duty Cooper ST/Maxx tires that preceded them.

 

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Just wondering if anyone who has the AT3 4s' are still using them and how are they holding up after a year+ of usage? I'm looking to pick some up.
I don't have the 4S, but I have been very happy with the original AT3's that I put on our '06 five years and over 30K miles ago. Like Mr. Bills mentioned, I have only good things to say about Cooper tires. We have Cooper's on 3 of our 4 vehicles.

That said, be sure that you really do in fact want P rated tires. Many people on this forum choose LT tires for greater durability, and unless something has changed since I looked into it before, the 4S are exclusively P rated with no LT options.
 

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. . . be sure that you really do in fact want P rated tires. Many people on this forum choose LT tires for greater durability, and unless something has changed since I looked into it before, the 4S are exclusively P rated with no LT options.
The Cooper Discoverer AT3 4S series are indeed P rated tires, not LT tires.

I would not run P rated tires on an Xterra that is used offroad.

I would run an LT tire - with a C load rating if at all possible. The Cooper Discoverer AT3 LT and XLT series would be appropriate for an Xterra used offroad. The Cooper Discoverer RTX might also be a good choice for mild offroading, but those don't seem to be nearly as popular as the AT3. I have never been a fan of the Cooper Discoverer ATP, which is only available from Discount/America's Tire and which is spec'd for a lower price point . The ATP doesn't get the same good reviews as the Cooper Discoverer AT3.
 

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The Cooper Discoverer AT3 4S series are indeed P rated tires, not LT tires.

I would not run P rated tires on an Xterra that is used offroad.

I would run an LT tire - with a C load rating if at all possible.
Why load range C preferable? Just curious what you think. I have been mostly considering LR E for mostly off road use as I retire the x from DD duty.
 

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A C load rated LT tire is the best match for the weight of an Xterra. A C load rated tire will ride better on the highway than an E load rated tire so if one's Xterra is a typical weekend warrior a C load rated LT tire is probably the best choice. (Nothing pejorative about the term weekend warrior - if one works for a living and an Xterra is one's primary vehicle then by definition that Xterra is a weekend warrior.)

Many LT tires suitable for an Xterra are only available with E load ratings. The sidewalls will be stiffer and the tires will be heavier than a C load rated tire. The ride will be more harsh in comparison. If a particular tire is only available with an E load rating and that's the tire you want then go for it, but if that same tire is also available with a C load rating the C load rated tire may be the best overall choice.

There are circumstances where the stiff sidewalls of an E load rated tire are an advantage, but primarily when that tire has 3 ply sidewalls. I ran Cooper Discoverer ST/Maxx LT265/75R16-E tires for 40,000 miles on my Xterra specifically because I wanted the rugged 3-ply sidewalls vs. the 2-ply sidewalls typical of most C, D and E load rated LT tires. I only went back to C load rated AT3's because I now have a jeep for rockcrawling and "tough" trails and my Xterra has been relegated to overlanding/mild offroading where 3-ply sidewalls are unnecessary.

There was a time or two during my recent 4,200 mile overlandinbg trip to Cabo San Lucas when I questioned whether I should have purchased a new set of ST/Maxx tires and stayed with 3-ply sidewalls, but I had no issues with my new AT3's, never got stuck, and the ride was comfortable both on and off road so those doubts have been resolved..
 

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I dont plan to do a lot of offroading/rock crawling like many of you here. The most my X sees are dirt/logging roads to get me to trailheads for hiking/camping. I'm coming from the stock hancook (Prated, 37# at 114T) to a similar tire thats slightly beefier (P rated, but 41# and 116T). Hauling my trailer with a tire thats 45-55# (C-E Load) would likely take a devastating hit to my ability to pull at 100km/hr with a headwind/uphill. The hancooks did well with my trailer, so I'm excepting the AT3's 4S to be slightly better.

Thanks for the feed back on the tire. I think I'll pull the trigger on these as they're on sale. 5 tires for $600Cad, taxes in.
 
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