Cooper Discoverer STT review

After driving 800 miles on my new regular cab 4x4, I decided to toss the dungflops on craigslist (which were sold in 4 hours for 200 bucks ), and put on a set of Cooper Discoverer STTs. I stuck with the stock size of 245/75/16 because I'm trying to fight the mod urge. I told myself before I picked the taco up that I was not going to get mod happy anymore, and that I would keep the truck as close to stock as possible, we'll see how well I can resist. Anyways, the STTs are 10 ply tires as I couldn't find any C or D load MT tires. I don't need the strength of the 10 ply as my truck is a lumber hauler, and occasional off roader, with the off roading being more towards mud and dirt, and not rocks. So far I have been pleasantly surprised with the on road manners of this tire. I was afraid the E load range would make my taco ride like a tank, but it has actually been just as comfortable as the stock tires. Also, tread noise is very very quiet for a tires this aggressive. I barely hear a hum coming from the tread. I haven't yet got the chance to run it through some mud, but as far as on road goes, these tires would fool you to believe that you were riding on some Michelin touring tires.

I was wondering about tire pressure. I had it at 40psi the first day and 31 psi the second day. Lowering it to 31psi obviously softened the ride a bit, and I guess I'll just do the chalk test to find the correct psi, but is there such a thing as running an E load range tire too low ?

 

Can anyone answer my question about having too low of a psi in an E load range tire? thanks.

 

On these light trucks an E load is overkill. While it is possible to run a tire too low, I think you'd be fine with what your door jam says.

 

Just do the chalk test. That will tell you what PSI you should run.

 

^that

i used a dusty parking lot...went down til i saw dust across the full tread..i'm usually at 35f/34r..but that's a 285/70/17 D rated duratrac (more in front due to the ARB & winch)

 

Don't go by the door jam. LT tires require more psi than P tires of the same size. I'd start with 5-8 psi more than the door jam numbers, and chalk it from there.

 

Maybe I've been wrong all these years, but the only time an LT tire should need MORE air pressure than a P rated tire is if you are actually carrying the full load that the LT is rated for. Otherwise, if you are going down the road with an empty bed, it will feel like riding on rails.

 

Nope. An LT tire of the same size will require quite a bit more air. Here's something I put together on another forum that might help:

There seems to be a million different opinions out there for what air pressure is best for X size tire on X vehicle. I've done plenty of searching and found this guide from Toyo that makes selecting a good starting point much easier.

On this link, there's an inflation table link that will download the file in PDF format. Lots of reading if you want to understand better, but I'll break it down to basics.
http://toyotires.com/tires-101/load-and-inflation-tables

1. Somewhere around page 14, you can start looking for the stock type/size tire that came with your vehicle. Check your door jamb for the recommended tire pressures, and find those pressures on the columns next to your tire size. It may not be exact, but you should be able to calculate what yours might be.

2. Take note of the load weight listed for your stock tire/pressure. Some are different for front and rear.

3. Keep scrolling down till you find your new tire size. Find the column with the closest load weight to your stock setup, then scroll up to see what psi matches it. Again, it won't be exact, but should be pretty close.

When I did this for my 285's, it said 35 psi would be about right. The chalk test proved that this was almost dead on. I ended up with 36 psi after chalking them. For the 255's I'll be putting on, it says 43 psi will be what I need. So I'll start around 45 psi and chalk it from there.

 

I just had a guy I work with tell me that my tread would last longer on a 10ply tire as my RC doesn't weigh as much as his DCSB truck does, and he has all steel friont and rear bumpers, IS that true?

I would love to have the Cooper SST in a 265/75/16 on my stock steelies but I really want to keep my front mud flaps,

The boys at Discount Tire are pretty sure I'll be ok...

 

Update please...
What pressure you running? Tires wearing evenly? Any offroad, snow, rain, mud, yet?
I'm looking to get these tires soon.

 

Writing a review on tires that you've put less than a 1,000 miles is like writing a review on a new car with less than 1,000 miles.

Report back when you hit 20,000.

 

I am a fan of the cooper stt. This is the second set on my 2000 trd off road 4x4. 1st set I changed them out with 48,000 on them and hand about 5/16 thread left. Currently have 25,000 on second set. I got rid of the rugged trail on my 2012 and purchased a set of cooper stt in 265 75 r16 with only 250 miles on the truck. Smooth and quiet in my opinion and made is USA.

 

HA, I didn't realize people were interested in this thread. Alright, so I now have close to 6000 miles on them and I just did my first rotation. Tread wear is dead even front and back. 16/32s of the original 18/32s remain. My driving has been 40% city 60% highway. I'm running the tires at 31psi. I never got around to doing the chalk test, but wear across the tire, at the center to the outer tread blocks, are the same. I have't yet done any off roading,but we did have a small amount of icy compact snow last week, and the tires were clawing right up fairly steep hills in RWD. However, taking turns the truck would fishtail pretty easily. I guess that has more to do with the fact that my bed was empty. Again, this was a very icy snowfall. Otherwise, I'll add that these are very quiet tires for what they are and I have had no trouble with them at all. I'll keep you guys posted.