Cooper Discoverer STT's

[Newps]

The other day having a screw removed from my lousy street tires I decided to price out some BFG MT's and the guys kept telling me I should get these Discovery SST's and BFG you just pay for the name. But from what I have heard from friends I trust and others on here you also pay for a quieter street ride and they last almost too long.
Being as my rig is a DD I think I want the quietest Mud's I can get and will pay an extra $30 dollars per tire.

I think your friends were referring to BFG AT not the BFG Muds. BFG tires are truly assume tires but the BFG MT’s have a few issues IMOP. They are not very quite, do not last long and give a rough ride. They are perfectly fine until after 10k. This is when the cupping starts. Cupping is an irregular wear pattern that IMOP leads to the rough ride and loud on payment sound. If fact if you do a road trip with these tires you will begin to notice a constant annoying hum that takes to few days to get rid of. I can only relate it to being on a boat for a few days then hitting the shore. You still fell like you are on a boat for a day or so. This is what this tire does to my ear. Even after I would get out of my truck, I still hear the humming for a day or two. I love the BFG AT but not the MT’s. I think there are better tires out there like the TOYO MT, Goodyear MTR's & now these Discovery SST's. Keep in mind this is just my experience others may differ.

 

[kennyv0826]

The other day having a screw removed from my lousy street tires I decided to price out some BFG MT's and the guys kept telling me I should get these Discovery SST's and BFG you just pay for the name. But from what I have heard from friends I trust and others on here you also pay for a quieter street ride and they last almost too long.
Being as my rig is a DD I think I want the quietest Mud's I can get and will pay an extra $30 dollars per tire.

The BFG MT is a good tire (especially off road). But when you are still using the same tread design for approx 20 years with only one addition over that time (a small rib to help clean out mud) you can't expect it to compete with the newer C.A.D. tread patterns and super complex rubber compounds. I would take the Discovery's over the BFG's any day without even a test drive on either one. I still think the Toyo MT is prolly a better tire than both but you do pay dearly for them.

 

[Bluetribal]

Man now I am confusded!!!!
My old boss did have the AT's and I wheeled in the passenger seat for a few years while he had those. Now he has the MT's and he said no question get the MT's they are kick A$$ offroad and not much lounder on road. I haven't wheeled with him since he got them but he told me I could drive his truck (Tundra) whenver to see for myself. He may be coming up on 10K miles soon so I will have to ask how he likes them after that.
I sure wouldn't mind paying less for the STT's so I guess I have to decide in the next two months. What is there 33" size?

 

[BPMOU]

The size is 285/75 16. Everyone has BFGs. I wanted something diffrent, so I went with the STT. I can't wait to see how they handle out east in the mud where we go hunting.

 

[Romer]

I am looking at getting a set of these in 315's and giving Sarah my BFG AT KOs (285's). Since the 315's are more like a 34" tire and these are much lighter than the Toyo MT's, it would seem the need to re-gear would be less.

Any comments on how you like these tires and relative to the 315's and re-gearing would be appreciated. Seems to me these are in between the AT and MT catagories and based on what I read will provide a quiter (for an MT) ride while being more aggressive offroad than an AT tire.

Thanks

 

[notyourmomslx450]

I thought the whole idea of regearing was to compensate for the added rolling circumference of a larger tire rather than the added weight. Since you are running a tire that travels further per revolution, it effectively lowers your final gear ratio, which is why you'd need a lower gearset somewhere upstream (usually in the diff). I may be off, but that's my 2 cents.

 

[Romer]

You are correct. The guidelines generalyy are 33's don't need a re-gear but 35's do. These 315's are really 34's.

 

[Mikey]

Romer I would say that it depends on what you intend to do. If you only crawl a little and you don't go on very hard trails you might be happy with a 34 and your S/Cer. If you plan on doing advanced trails your s/c will not be enough because you are just making more power not changing the affect the larger tires have on the final ratio and axles, berfs, drive shafts, etc. You will be putting a lot more stress on these items. Plus you will not have the "crawlabilty" in the rocks and other obstacles. Not to be rude but are you tring to avoid regearing because of price, time, and hassle? If you are, I understand I have avoided it in the past to. Once you regear for the correct tires it makes a world of difference. My 4.10s with 285s are a dog compared to my friend 4.88s and 315s. The 4.88s are the best thing I could do to mine right now. When I put on my 315s things get slow. Nay is happy with his set up and that is fine. I run 285s and 315s in flat O2 rich MN and am happy too because I'm waiting to save and do lockers and gears at the same time. Its all what you want to do and how much money you have. It cost money to go fast.

 

[Romer]

No rudeness taken.

I plan on re-gearing to 4.88's. I was just curious were the line from 33's are ok with stock gears to 35's you need to regear was.

I like these Cooper STT's. Kind of torn between those and the Toyo MT's Toyo is taller and heavier. Other than that, they seem very similar, evenm in tread pattern. I also like the TRXS, but feel that would be louder than I would like.

 

[Mikey]

The cooper is a great tire. Its has a nice tough side wall. Is farly quiet and is a good patter. The rover guys are running them a lot with success. I have also seen them on a lot of diesel trucks. I have not run toyos but have worked with them. The Interco Traxus is a nice tire but is noisy, chuncks, and does not ballence as nice as the others. The toyo is the nices to balance but is $$$. The STT is an awsome tire for the money but can get spendy to. Check around a couple of tire places before you buy the STT or the Toyo the prices vary.

 

[Bluetribal]

After reading Romer's Tire FAQ I went from 90% on these tires to 100%.... But I am wondering if anyone knows the full size chart for these tires. I was just on the Cooper website and when you go to these tires the info box goes blank? The reason is after reading LXCRSR's write-up I was confused to read that he got 315's to fit in the spare tire location. Apparently the 315's are actully 34". I was planning to go with 285 tires because the grade up to Mammoth would be pretty harsh but if these tires run smaller maybe I can go with 305's and have less trouble than I would with say BFG 305's.....

Thanks

 

[MaddBaggins]

I'm running the 315/75 16 they are 34.5"

go here, click on tires, click on light truck, find the Discoverer STT and click on "view full specifications" for a full size chart
http://www.coopertire.com/Flash/index.aspx

 

[FJBen]

No rudeness taken.

I plan on re-gearing to 4.88's. I was just curious were the line from 33's are ok with stock gears to 35's you need to regear was.

I like these Cooper STT's. Kind of torn between those and the Toyo MT's Toyo is taller and heavier. Other than that, they seem very similar, evenm in tread pattern. I also like the TRXS, but feel that would be louder than I would like.

You sure you don't want 35" trxus?? I'll sell ya mine so I can move up to 37's

 

[Nay]

You are correct. The guidelines generalyy are 33's don't need a re-gear but 35's do. These 315's are really 34's.

Those are bad guidelines. 315's with OD off are a better match for stock gears than 33's. At our elevations, I have not found any material difference between 33" and 35" tires, except that OD off at 65 mph is a better RPM match.

You have a supercharger so it's not going to be an issue, and if you want a bit more regearing for anything but OD, press that little PWR button for free. I lug around on true 35" load range E trxus tires with 4.10's and no forced induction and do just fine. A few lbs of weight on the Toyos isn't going to be a breakpoint for regearing, so don't size down just because of that. The only reason I'd regear is offroad...4.10's are a bit high for 35's and a stock engine.

Does snow performance matter to you? The Toyos are siped and that will make a major difference if it matters.

Nay

 

[LandCruiserPhil]

After reading Romer's Tire FAQ I went from 90% on these tires to 100%.... But I am wondering if anyone knows the full size chart for these tires. I was just on the Cooper website and when you go to these tires the info box goes blank? The reason is after reading LXCRSR's write-up I was confused to read that he got 315's to fit in the spare tire location. Apparently the 315's are actully 34". I was planning to go with 285 tires because the grade up to Mammoth would be pretty harsh but if these tires run smaller maybe I can go with 305's and have less trouble than I would with say BFG 305's.....

Thanks

Just below the box you can click for full specs on all sizes.

 

[Romer]

I found you need to look in the Light Truck section. The STT's in the SUV section are the radials that are discontinued and that is blanked.

Based on what I saw, these are siped as well. You can also have a tire shop do that.

Leaning towards these tires. I think I'll get a qoute on these and the Toyo Mt's and decide. If they are the same price, probably will go with these. Probably cheaper based on what I read.

 

[BPMOU]

Hey Ken,

For what it's worth I had a hard time finding the Toyo MT's locally and when I did the price was close to $250 a tire from Performance Wheel and Tire, keep in mind these were for 285s. I got the STT from Swiss for $190 a tire I think, and they have a 10% off coupon. I also had Performance get me a quote for the STT and then gave that to Swiss and they matched it and let me use the 10% off coupon which took care of the mounting and balancing. The STT is siped but not a lot. I am thinking about getting them siped by the tire shop for added traction for the winter.

 

[tarbe]

Ken

I just bought a set of 315 Toyo MTs. They were $50/tire more than the same size STT here in Houston.

I think the STT is an excellent tire and it was my number two choice. Cost did not really factor in...I figured $200 over the life of a set of tires (~3 years) is not worth fretting over.

Those Toyos weigh about 13 pounds per tire more than most other 315 tires, and I believe it is mostly in the sidewall. You simply would not believe how thick the sidewalls are. It is possible that the thicker sidewalls might reduce conformity in the rocks. But what I saw of the tire at Flat Nasty told me they bite real well.

Will this thicker sidewall translate into more rock security? Can't say for certain, but I am betting ($200) that it will.

The Toyo is not heavily siped, either. Could use more for a snowy location.

 

[Romer]

Thanks TIM,
I believe both the cooper STT and Toyo MTs are great tires and have them as my top two tires. It seems a lot of other folks do as well. So I have started a seperate thread to just compare the two tires:

https://forum.ih8mud.com/showthread.php?t=114850

I am pretty much decided on the Cooper, but there are a few points worth discussion

edite: I ended up with the Toyo's all though I am convinced the cooper is a great tire. Se the link above for why.

 

[BajaTaco]

11,000 mile update

11,000 mile update:

32x11.5x15 on a heavy GVW Toyota Tacoma Xcab.

They are wearing evenly. I have rotated them once so far. The sidewalls and treads have held up really well considering the abuse I have subjected them to. No major chunking or loss of lugs. I just checked and am surprised to find out that with 11,000 miles, the current tread depth is at 12/32" (67% of usable). At this rate, the tires will wear out before I get 20,000 miles on them. And considering that I usually replace tires at 50%, they may only see a few more thousand miles on my truck. Granted, the percentage of miles in the dirt and in 4wd for my truck is very high (no daily commutes and lots of overland trips) but that is pretty dissapointing and will make this a very expensive set of tires. So my opinion as of today - is that they are great tires if you can afford the short lifespan.