Cooper Discoverer STT PRO - Deep Look

WyoCherokee

Adventurer
Ran these for about 3 months. Loved every aspect of the tire and its performance, aside from its performance on ice. Hands down the best off road/on road tire ive ever had. However due to the amount of winter highway driving i encounter, i needed a better tire on ice. If you live in a climate where driving on ice is an extreme rarity, do not hesitate to get these tires.
 

Fargo

Adventurer
Thanks for the link. I knew that article was out there but I was not able to view it before.

WyoCherokee - So did you sell the STT Pro to get the STMAXX in your signature? Can you give a little more comparison? Between this post and what you posted on my 255/85 thread, you have me really questioning my decision about getting the KM2s for my LJ.
 

ox4mag

Explorer
Ran these for about 3 months. Loved every aspect of the tire and its performance, aside from its performance on ice. Hands down the best off road/on road tire ive ever had. However due to the amount of winter highway driving i encounter, i needed a better tire on ice. If you live in a climate where driving on ice is an extreme rarity, do not hesitate to get these tires.

That's some good feedback and will certainly share it with James who authored the write-up.

What are you using given the ice where you're at? Any thoughts on the KO2 and its performance in ice?
 

3 DOGS

Observer
I had a set of the STT Pro ordered and ready to mount on my '12 F150 FX4 SCREW but after doing some more last minute research and honest talk from the Discount Tire rep I switched to the KO2.
I've run the old KO for 4 years on my truck and had pretty good luck with them - deep muddy conditions were really the only thing that presented issues in my travels. Runs to Jackson Hole, Grand Lake CO, Colorado Springs and across Nebraska I never once had an issue with ice and snow.
I have run the KO2s on my H3 for a year and a half now and they are a perfect tire on there. Not one problem with any weather conditions - rain, snow or ice - I haven't run into muddy conditions yet with the H3.
I decided that the STT Pro just wouldn't be my best choice for the types of snow and winters we have in Nebraska. In eastern Nebraska there seems to be more icy and packed snow conditions vs. wet heavy or even powdery snow like in the mountains. My concern was a lack of siping (which I did think about paying to have done) and a lack of tread blocks that would assist with griping the snow and ice.
Having just put them on the truck a month ago I haven't dealt with mud, snow or ice. I have dealt with highway travel and rain - lots of rain and the tires performed great. No issues with noise, drifting or hydro-planing. I'm impressed thus far with the KO2.
I also looked at the Duratracs after a couple of recommendations but I couldn't justify the extra money - especially on a tire I have zero experience with.
Just my 2 cents on the KO2s and why I didn't get the STT Pro
 

bunger

Adventurer
.....I also looked at the Duratracs after a couple of recommendations but I couldn't justify the extra money - especially on a tire I have zero experience with.
.....

I have run Duratrac's for about 5 years. We have all the weather extremes here in New England and they has performed flawlessly.
I do a lot of offroad including sand, rocks and mud. No problem for the Duratrac's.
 

OSV

Adventurer
much of the article is devoted to "new rubber" basics, but i couldn't find any relevance to the tire being reviewed, because the article doesn't specifically state that the stt pro is made out of the new rubber, what percentage of the tire made from the "new rubber", etc.

this tire comes in both 37x12.50x17 and 37x13.50x17, with only a .3" difference in sectional width, but it's 8-ply vs. 10-ply, and there is a ~9lb. weight penalty.

it would be nice to know the differences in ply construction, specifically if the 10-ply has more sidewall reinforcement.
 

WyoCherokee

Adventurer
Thanks for the link. I knew that article was out there but I was not able to view it before.

WyoCherokee - So did you sell the STT Pro to get the STMAXX in your signature? Can you give a little more comparison? Between this post and what you posted on my 255/85 thread, you have me really questioning my decision about getting the KM2s for my LJ.

Yes i sold the PRO's to buy the MAXX's. My decision was based on having the MAXX's on my diesel and loving them. The Pro's just were not the best on icy roads. i could be putting along at 30mph in a storm, regardless of tire pressure and it would kick out sideways. With the Maxx's, it still happens from time to time, but not near as much and i feel the handle hard pack snow better. The Pro's were better in slush and powder, but not so in ice and hardpack snow.
 

WyoCherokee

Adventurer
That's some good feedback and will certainly share it with James who authored the write-up.

What are you using given the ice where you're at? Any thoughts on the KO2 and its performance in ice?

Wont touch a KO2 with a10 ft pole. Ran them for a very short while and parked the rig until i could get better tires. I am using the STT MAXX.
 

1stDeuce

Explorer
Big surprise, you guys running mud tires and complaining about ice performance... Even the Maxx's that I have on my Jeep are not that great on the packed snow and ice. But they do acceptably well, and they do mud acceptably well too. It's called compromise. :)

I'm sure the STT Pro's are GREAT mud tires, but a great mud tire will always sacrifice ice and packed snow performance. If you desire better snow performance, I'm told the new AT/KO 2's are excellent, and the closest you'll come to a true winter tire that can be run all year long. I think Cooper ATW's are a bit better on ice, but a little faster wearing.

Everything has it's place... I loved my old STT's in MI, where I was in mud occasionally, and ice/packed snow a little less often, but out here in the wild west, where I'm as likely to see snot clay mud as ice and snow and slush, or rock of many kinds, I find the Maxx's to be a great compromise. If ice/snow weren't a concern, I'd probably opt for a set of STT's, or perhaps the new STT Pro's. (I really
liked my old STT's...)

YMMV (depending on inflation pressure, temperature, available torque, vehicle weight, snow/ice conditions, etc...) :)
 

Airspeed

New member
I love my STT PRO's! Off-road, they just chew. I don't do a ton of mud but they pull very well on steep ascents. In the mud, it's an obvious on how well they do. On-road performance is great as well.

I did buy a set of BFG KO2's for the winter months and longer expedition trips. They save a bit of fuel, quieter on the highway and still do very well off-road. Plus I got them in a taller pizza cutter size and love the look! (34x10.5").
 

Redline

Likes to Drive and Ride
M

Big surprise, you guys running mud tires and complaining about ice performance... Even the Maxx's that I have on my Jeep are not that great on the packed snow and ice. But they do acceptably well, and they do mud acceptably well too. It's called compromise. :)

YMMV (depending on inflation pressure, temperature, available torque, vehicle weight, snow/ice conditions, etc...) :)

Exactly x100 ;)

I think something along those lines ('mud tires are not great winter/ice tires') is in the article...
 

Redline

Likes to Drive and Ride
much of the article is devoted to "new rubber" basics, but i couldn't find any relevance to the tire being reviewed, because the article doesn't specifically state that the stt pro is made out of the new rubber, what percentage of the tire made from the "new rubber", etc.


Not really...the sidebar/second part is about Guayule rubber, a separate topic related to tires overall.

In the original magazine layout format, the separation is more obvious.
 

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