Cooper Discoverer S/T MAXX | 78,000 Mile Review! 

I have a 16 trail and live in MAINE where we get lots of snow, the 4runner is a great winter rig with any brand tires on it. Those metal things are called expansion joints. That's an amazing amount of mileage out of any truck tire!

Great review man! Thorough and to the point. I'm running the Discoverer AT3 XLT's on an F250 and I love them.

Good review, I am running my 3rd set (275 70 and 285 65R18) and I am at about 76k and 8/32 yesterday with rotation. The only addition I would add to the mud review is when they fill up, a little wheel spin cleans the outer edges and they will move where traditional AT’s may stay clogged. In 3 sets, I have yet to patch a tire. My next will be the ST Maxx again.

My old Nitto Trail Grapplers had the same problem with the metal plates/draw bridge plates, would lose traction instantly. Possibly due to the hardness of the rubber - they were E rated.

I had bought a set of 255/80-17 ST Maxx tires for my '16 Ram 1500 4wd 3.0L. The tires ran fine at the stock air pressure. I had gotten them siped at Les Schwab. Traction was unbelievable in all conditions. The siping was very important to add. I used the stock 17x7 rims, and would recommend 17x9 and a wider size. Tall and skinny tires may have a lower purchase cost. But a wider tire is better for the amount of rubber on the road. Remember that these tires have big voids to get all that traction bite.

This helped a lot, thank you! Got about 5,000 miles on mine so far 👍

Awesome video man I have a jeep grand cherokee overland and when I bought the vehicle a year ago it had these tires on and just did engineer pass and imogene pass love these tires just bought four new ones two days ago just wanted to share that and like your video.. peace

I don't run tires longer than 4 - 5 years. I’ve herd that the chemicals in the tire degrades after that, giving less traction on pavement. I currently have the General Tire ATx and am amazed with the traction I get in the wet compared to the Nittos that came with the truck.

Good review! We have a Land Cruiser with KO2s that are piss pore in the rain so they have got to go even with 60% tread left. I have looked at all kinds of tires but never the Cooper S/T Maxx. I have had several sets of Cooper tires over the years and love them so this could make us a good tire. Thanks for doing this review.

A little surprised after this review to hear that he decided to go with another set of tires. The review made the S/T Maxx sound like the perfect set of tires for his application (can't imagine any tires get great traction on wet steel). Oh well, I'm sold... the next set of tires I buy will be the Cooper S/T Maxx.

I have these same tires in 255/85r16 on my f250, got about the same amount of tread you do, but with about 40k miles. I love them though!

Ive got a little over 60k on my st max on my dodge 3500. All highway, oilfield lease roads, mud, snow, rock, these are badass.

I'd say I have close to an extra 800 pounds on my third gen tacoma and I run about 31 psi cold on a 285/75r16 on these tires, they're as good as they get (if you like to wheel*) I've brought them over some really sharp rocks and they might take a bit out of the tire but never compromise anything and around 12 psi on wet rock still has a really good amount of traction. I always tell people if theyre looking to do a lot of trail riding and want a tire that will perform amazing aired down on the rocks and get you anywhere in deep snow, ST MAXX is the go to especially how durable it is but if they dont do the riding then go with like duratracs because these are HEAVY and will tank mpg with a lot of road noise, but I don't really mind it. I think I'm 25k miles in and they got plenty of tread left, I'm just doing a 4 tire rotation too.

Run these (295-70-18) on my 18 titan. Theyve been excellent for 25k miles. Look to be about half life now.

That’s a lot of miles! I’ve got a set of 315s on mine and I’ve got 20K miles on them so far. At current wear rate they will last about 55K miles. Not bad! I like them so far but they took a lot of weight to balance. That’s my only complaint so far.

I had these tires on 2016 f150. I loved them for the first 40k miles but wet traction got really bad after that.

I’ve been looking for an alternative to Duratracs and I think I will give the ST MAXX a try.

Good review!

The third ply on the side wall is nylon which wraps the entire casing bottom in the sidewall not polyester

These tires are stud able, I know it’s not legal but I still run them all year long here in Montana where we only have about 4 months above freezing temperatures at night anyway so I always have the shop stud them for me and they run great in the winter months. Had them on my tundra and now on my FJ 315/75/16. I ran the stt pros on my Tacoma and they were the loudest damn tires I ever had on a truck. Never again.

I tried these when they first came out on my 1 ton dually. They were very scary to drive with no explanation why. Had one of the guys at the tire shop take it for a spin and he was back in less than ten minutes and agreed that we were sending them back. I ended up with another set of AT3's. It's a great A/T tire. Considering trying them again, because I love my AT3's, but those S/T Maxx's were horrible.

They are not 10 ply tires. They are 9. 6 ply tread with 3 ply sidewall. Although it was a good review just because a tire is load range E doesn’t mean it’s 10 ply. There aren’t very many 10 ply tires manufactured nowadays. Just stronger 7-9 ply tires. I’ve had my st Maxx’s for about 7000 miles now on a 1500 Silverado and I love them in the mud and snow for anyone who’s wondering 😂

Can these tires do sand? I live in Jacksonville Florida and near my house the locals take their trucks on the beach and go fishing

My english is bad. You recommended or not recommended this tyre?

Damn good review

Do you like these better or the AT3’s? Also are these better in the rain or the AT3? Sorry if you already mentioned this.

I hate my At3's. The original at3 were good I really liked them. The new ones, xlt/4s I've heard them called both, I absolulty hate. The original At3 I put probably 40k on and still had over half tread until I blew a hole in them from the township mowing the banks and leaving an old leaf spring on the road. Put on the new style At3 and I maybe got 20k out of them on my Seirra 1500 and their performance off-road wasnt completely awful but I expected alittle more. I just bought a set of the Maxx's and I hope these work out alot better on and off-road

are the tires rated for all season? i'm wondering if you can legally use them in the winter-time. In my country it's compulsory to have the 3PMS logo (three mountain peak) or the snowflake logo on the tires to be allowed to use them in the winter time. do these ones have that?

At 40PSI any tire will be bad on smooth surfaces. I think unless you are towing you should have been down around 30 psi and it is evident in the cupping you have.

With these being a 10 ply lt tire how is the comfort level on dry paved roads? If these came in a standard load I would definitely buy them but because they don't I'm also considering toyo open country at3 and grabber atx. I have winter rated tires I'll be using in winter time. How much of a hit in comfort will there be if I go for a 10 ply versus a standard load tire? I have a 2015 ram 1500 ecodiesel. I don't do much towing or carry heavy loads or else I would have gotten then st maxx.

Me still waiting for your new video about the cooper at3s ☠️

Great video...I’m currently deciding between the ST Maxx and K02 for my DD FJ Cruiser...are the Coopers a better choice for a daily.?

I live in Florida where we get swamp muck and sugar sand. How do you think these would hold up ?

Yeah, I'd say all tires would not do well on smooth metals.... thought this was a weird thing to comment and go on about...

You have 78k on them because they aren't at all meant for that tiny little vehicle. These are for large trucks that haul and tow. A 10 ply tire on a grocery getter....yeah they are way more tire than necessary. Also these are meant to be aired up higher than 35 to 40 psi.....they are generally ran at 60 to 80 on the trucks they are designed for.

What about in snow on roads?

How does this compare to the BFG K02?

Mine are very loud 😖

Are they 3PMSF?

How tall is your lift?

“Tow” with a 4 Runner....Hauled a full load Starbucks.