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Reviews - Cooper Discoverer STT On / Offroad Tires Reviews by Offroaders.com - - - - - - - - - - - - - - - Review Engine Powered by ReviewPost


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88% of reviewers $326.05 8.0
Cooper-Discoverer-STT.jpg


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Description: Cooper Discoverer STT On / Offroad Tires


The Discoverer STT is Cooper's premium high void off-road light truck traction tire designed for drivers who want the utmost in off-road traction. It is offered in a wide range of commercial and large diameter flotation sizes and is designed for use on pickups, SUVs and off-road vehicles.


DEEP BUTTRESS LUGS


The Discoverer STT's aggressive tread design extends far down the sidewall of the tire to enhance its soft surface traction and also provide additional “bite” in rock climbing applications.
RIM FLANGE PROTECTOR


Strategically placed in the lower side wall area, this feature helps protect the wheel and tire from hazards in off-road driving conditions while enhancing appearance.


TAPERED STONE EJECTORS


An integral stone ejector rib extends down from the center lugs to the buttress blocks to help prevent stones and debris from lodging between the tread elements while contributing to the overall soft surface traction.


SUPER TRACTION TREAD


The Discoverer STT's computer designed, non-directional tread employs a combination of features including deep buttress lugs, notched and scalloped shoulder lugs, and a unique center traction zone to create a bold, aggressive tire for tough off-road applications.


ARMOR-TEK3 CARCASS CONSTRUCTION


The heavy duty carcass of the Discoverer STT is constructed of two radial polyester body plies and one angled polyester body ply to deliver 3 plies of protection for superior resistance to impact breaks and bruising.
Keywords: Cooper Discoverer STT Mud Terrain MT


      Cooper-Discoverer-STT.jpg

Anonymous
Review Date: Sat March 21, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 1 

 
Pros: CHEAP and that's it..
Cons: wear extremely fast - everything else that could possably go wrong

As to saying yes for recommending this product ,I will recommend to everyone out there NOT to buy these tires. they are garbage..got less than 6000k out of these! almost half of the lugs tore off or peeled away after the first dirt road. down to 1/8th of tread left..6000k..not worth it
Anonymous
Review Date: Sun March 29, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 10 

 
Pros: you get your money's worth
Cons: i wish mine were bigger

I do alot of hunting and running down country roads and yea i have not really tested them like some of the other guys but for me they do an excellent job and look great to i never got stuck going out hunt and the lanes i use are some of the tuffest they are on my every day truck and the highway and the tires do not lose their tread as fast as most of the big mud tires do so if you want a tire that will be worth the money it is this tires no doubt about it
Anonymous
Review Date: Sun March 29, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 0 

 
Pros: look and price and wear
Cons: ???????

these tires are the best for every day trucks that see both highway and mud in the same day they wear great and slow you cant really go wrong with these tries
Anonymous
Review Date: Tue March 31, 2009 Would you recommend the product? Yes | Price you paid (per item)?: $300.00 | Rating: 10 

 
Pros: 3 years and still going
Cons:

3 years and 35,000 miles on a set of daily drivers. What more can ya say.
Anonymous
Review Date: Thu May 14, 2009 Would you recommend the product? Yes | Price you paid (per item)?: $800.00 | Rating: 8 

 
Pros: GREAT ON HWY AND MUD
Cons: AS WITH MANY AT TIRES THEY NEED MORE STOPPING ROOM

I HAVE A SET OF 35 X 12.5 ON MY STOCK RIMS ON A 2004 CUMMINS POWERED 2500 DODGE RAM. I DRIVE ALL OVER THE EASTERN US FROM KEY WEST TO MAINE AND IN ALL CONDITIONS. IF YOU WANT A GREAT SET OF TIRES THAT DO IT ALL THESE ARE YOUR TIRES. MANY TIRES DO CERTAIN THINGS A BIT BETTER BUT FOR ALL AROUND USE I LOVE THEM AND MY OLD SET OF BF GOODRICH ALL TERRAINS WORE MUCH FASTER WITH REGULAR ROTATIONS. I HAVE 20,000 ON THESE AND THEY ARE JUST STARTING TO SHOW SIGNS OF TREAD WEAR I BET I GET 40,000 OR BETTER AND I'LL GO RIGHT OUT AND GET ANOTHER SET!!!
Anonymous
Review Date: Tue May 19, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 10 

 
Pros: loved them
Cons: none

i had a set of 31x10.5s on my stock wrangler and loved them 35k and they were barely 50% i bought them again in a 35in flavor for my jeep got 15k on them and sill loving them
Anonymous
Review Date: Thu May 28, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 10 

 
Pros: rooster tails
Cons: none

i had these on my 91 2x4 silverado when i was 16 they were 31x10.5 and i only put them on the rear axle. they were the best thing i ever did with just one wheel spinning i never got stuck in anything and i went places my buddies in 4x4's wouldn't go, now ive got a set of 285 on my 95 seirra 4x4 and they are just as amazing as they were with my two wheel drive.
Anonymous
Review Date: Thu June 11, 2009 Would you recommend the product? No | Price you paid (per item)?: None indicated | Rating: 4 

 
Pros: look cool
Cons: wear out too fast!

I only got 11000 miles out of the 35x12.50-17 they have a real soft compound and no treadwear warranty.they work well in the cold winter months but in june july august forget about it they melt!
Anonymous
Review Date: Thu June 11, 2009 Would you recommend the product? Yes | Price you paid (per item)?: $270.00 | Rating: 9 

 
Pros: Great tire for off road
Cons:

I just want to add that these tires will blow some f***ing mud. They're great with the sidewall and all. They just keep on going!!
Anonymous
Review Date: Fri June 12, 2009 Would you recommend the product? No | Price you paid (per item)?: None indicated | Rating: 1 

 
Pros:
Cons:

i live in the philippines and this tire suck!!! almost all the tire retailer here in the philippines are complaining about the cooper m/t's and cooper a/t's.... side wall are very very weak.. easy to crack.. try to touch the side wall b4 the armor head very wavy!!!.. and also under size.. very cheap but under size.. i recommend nitto tire or toyo tire best tire ever...
Anonymous
Review Date: Fri June 12, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 9 

 
Pros: Looks, quality and traction
Cons: Need to be siped by tire shop

Some of these reviews must be written by competitors or nut-jobs. I realize tires behave differently on different vehicles, but c'mon. No tire is great on ice, and these are no exception. I recommend getting them siped and keeping them rotated. Never use petroleum based cleaners or dressing like Armor All; it dries tires out and they eventually crack. As for mud, snow and street they do very well. There is a hum on the road, but all ATs and MTs hum. Buying tires is about balancing your needs. If you need a street tire, buy a street tire. If you want a tire that does well in all conditions, try the STT. They wear very well and are well built. They look very very cool too! My previous tire was BFG AT KOs and they were a great tire. Unfortunately, after five years they developed serious cracks in the tred and sidewalls. This tire is just as good and is more aggressive and looks MUCH better. People stop just to take a second look at the tires. For the money and quality, this is an excellent tire purchase.
Anonymous
Review Date: Thu June 18, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 7 

 
Pros: I had them on a 95 mazda b4000 and they were awsome in the mud and snow I never got stuck they ere a great tire for vt
Cons: they werent the greatest on ice

they are a decent priced mud tire
Anonymous
Review Date: Sat June 27, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 10 

 
Pros:
Cons:

1 have a set 35-12.50R17LT cooper discoverers on my 1995 gmc z71, they are bad ass tiers
Anonymous
Review Date: Mon July 6, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 8 

 
Pros: Great wet road and trail traction. Low noise for an MT.
Cons: Rolling resistance. Needs high pressures on road.

Hi I live in the philippines too and these are fine tires.


They are 8-10 ply construction LT tires and require high pressures on the road or the sidewalls will indeed weaken and crack. My LT265/75R16 are 10 ply. I have to run 42-44 psi (cold) on my HDj80 landcruiser.


What I learned recently researching about LT tires:

An LT tire is nothing like a regular passenger tire. You can blow up a balloon with your mouth for it to reach its intended shape (round). How much psi is that? Not
much. But you cannot blow up a basketball without a pump. More psi. The much thicker rubber in an LT tire takes more psi for it to attain its intended shape i.e. a flat
tread surface, under a given load. So, for a given load, say a stock landcruiser, a OEM b-stone dueler HT will need 32 psi to achieve its flat tread while a 10 ply LT will need much
more, say 40 psi, to achieve a flat tread. Do not make the false assumption that the contact patch (length of footprint) for the LT tire at 40 psi is smaller than the 32 psi Dueler; if they are both at their equilibrium pressures, the contact patch should be comparable.

Now a dueler HT inflated to 40 psi will make your fillings fall out if it doesn't explode first (my bet's that it explodes), but the LT tire is at its intended
equilibrium at that pressure and the ride (given sufficient load) is not as bad as you would think because it's not a passenger type tire. It will be harsher than a
b-stone HT set at 32 psi, but not as much as you think. And as the load increases, the difference diminishes. So if you have a hi-lux (compact toyota pick-up) with the same 10 ply tire set
at it's equilibrium pressure of maybe 36 psi, the ride will be harsher than the LC set at 40 psi. So a 6 or 8 ply LT tire might be preferable (from a ride and
handling standpoint) for a pick-up.


Forget about the pressures in your owners manual, except as reference to calculate your estimated pressure for your LT tires. These numbers are for passenger type
tires. Underinflation of a LT tire will result in premature wear, high fuel consumption (especially for MTs), sloppy steering, and a weakened/damaged sidewall which
can potentially fail. 2 or 3 ply LT sidewalls retain heat generated at high speeds much more than passenger tires. See below excerpt from an oz mag article:

"When a tyre runs at a pressure too low, it causes flex in the sidewall in a concentrated zone. This flexing action causes friction in the various materials of the
sidewall and creates a band of excess heat along this point.
The heat build-up can quickly deteriorate the rubber in the sidewall and cause it to blister. The tyre literally starts to destroy itself from the inside out while
there is very little visual evidence of this. This action compounds as speed increases."


"So what is the right pressure? After extensive testing in Australian conditions, the people at Bridgestone formulated a rule of thumb for optimum on-road tyre
pressures.
Inside the driver’s door well there is a placard displaying the manufacturer’s recommended tyre pressure. Accounting for Australian road conditions and the continual
variance in the load your vehicle carries, Bridgestone's recommendation is 10 percent above what the placard reads. If your pressures are under the placard’s figure
then you’re underinflated.
Recommended tyre pressures are calculated on a cold tyre (25°C ambient temperature and out of direct sun), so the best bet is to check pressures in the morning
before driving."


Note that the above advice from b-stone did not even specify LT tires, it was given for their truck tires in general. BFG, as a rough recommendation, recommends a increase of 8-10 psi over the pressure spec in the owners manual when switching to their 8-10 ply AT or MTs.


A more precise way to determine correct pressure is given in the oz landcruiser lcool forum as follows:

"A subject which often pops up is the correct road tyre pressure for our Cruisers.


Here's the deal.... Check the tyre pressure cold. Hit the road for half an hour, stop and check the tyre pressures. You're aiming for a 4psi pressure increase (due
to heat). This will give you the right pressure to run for your tyre/axle load and speed combination. If it's greater than 4psi, you need to run more pressure. If
less than 4psi, they're over inflated and you need to drop the cold pressure.

This may however not be the ideal pressure. You may for example increase the pressure by a couple of psi for sharper handling or decrease slightly for more comfort.
You may also use more pressure at the front to decrease the amount of understeer.

Stiff sidewall tyres such as the BFG will require quite high pressure compared to a road based tyres such as the GrandPuke. A stiff sidewall will generate more heat.
The general rule for road based tyres is to not exceed 36psi no matter what. With the 285/75x16 BFG, it's not uncommon to pump them up to 65psi when running fast and
heavily loaded. "

If you have MTs, you may want to run a little extra pressure because of the increased rolling resistance (poor fuel economy), improved handling (less tread squirm), and better wear (we want to preserve our valuable shoulder blocks for off-road traction!). Too much extra pressure and you compromise wet traction.

A final note: Some think that if they switch a larger tire (more air volume) then they need less pressure. I found out this is not necessarily so. The variances
caused by tire construction have a much larger influence on what the equilirium pressure is. Typical upsizing diameter of 2-3 inches did not make a significant
difference in what that pressure is. Also, variances occur from brand to brand. A Goodyear 10 ply rated MTR equilibrium pressure for a given load will be lower than that of a 10 ply BFG or Cooper.

-mkh
Anonymous
Review Date: Thu July 9, 2009 Would you recommend the product? No | Price you paid (per item)?: None indicated | Rating: 1 

 
Pros:
Cons:

Cooper Tire Recall
Cooper Tire & Rubber Company announced the recall of nearly 300,000 Copper Tires due to slow leaks or cracks in the sidewalls of these Cooper Tires. According to Cooper, no recalled tires have caused any injury or death. The Cooper tire recall was necessary to prevent sudden tire failure, blowouts of Cooper Tires, tire tread separations of Cooper Tires and other tire failures that could result in an accident or rollover.


Defective Cooper Tires- Blowouts & Tread Separation Defects
If a Cooper tire looses air due to a defect, then the temperature in the tire increases, resulting in an even more dangerous condition. The Cooper tire recall includes over 180,000 tires from the Albany Plant. The additional recalled Cooper tires were from other Cooper tire plants throughout the United States. These Cooper tires are being recalled due to sidewall cracking and were manufactured between Novemeber 2004 and July 2005. As with many tire recalls, it is possible that additional tires models may be added to this Cooper Tire Recall. The recalled Cooper tires in this recall includes,XTR Mastercraft Courser Tire Recall,Cooper Discoverer S/T Tire Recall, Tempra Trailcutter Radial RT Tire Recall, Dean Alpha 365 A/S Tire Recall, Cooper Mastercraft A/S Tire Recall, Cooper Starfire Flight-line IV Tire Recall, Cooper Trendsetter SE Tire Recall, Zeon 2XS Cooper Tire Recall, Cooper Mastercraft Avenger ZHP Tire Recall, Cooper Dean Mud Terrain Radial, Copper Tire Recall, SXT Durango Radial Tire Recall, C/T Dick Cepek Radial Tire Recall, FCII Mesa C/T Tire Recall and Cooper’s Pro Comp Xtreme A/T Tire Recall.
Anonymous
Review Date: Thu July 9, 2009 Would you recommend the product? Yes | Price you paid (per item)?: None indicated | Rating: 9 

 
Pros: All of them
Cons: None

I love these tires, I have the 315/75/16 on my 2006 Hummer H3. Them are great offroad (rocks, mud, snow) and on (wet roads too), can be aired down really low and have really solid sidewalls, quiet on the highway for an MT and have gone nearly 40K miles and still have plenty of tread.
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Dunlop Rover M/T Maxx Traction
Editor

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