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New Cooper STT Pro

142K views 304 replies 98 participants last post by  larry0071 
#1 ·
How about this new tire. It's got some serious potential!!

I suspect it will be too heavy for the light weight crowd, but it will be massively durable for the guys that like to do rocks. Waiting for it to show up on the Cooper website so we can see some sizes. I do know it will be in the 295/70-17 size that isn't all that common.

This one will be a nice compliment to the already outstanding S/T Maxx.

 
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#2 ·
I happened upon the website linked below. They don't have pricing but it appears they have the available sizes listed. Not sure about accuracy but it's a start.

LIGHT TRUCK ALL SEASON
 
#3 ·
I happened upon the website linked below. They don't have pricing but it appears they have the available sizes listed. Not sure about accuracy but it's a start.

LIGHT TRUCK ALL SEASON
Looks interesting. They even have the stock size listed
 
#4 ·
Digging the sipping on the tire. I hope they come out with some c and d rated tires. The general trend seems to be shifting to almost all e rated which stinks for the wrangler crowd.
 
#6 ·
I have been looking at the STT Pro and the new MTZ p3 as replacements later in the year for the KM2s on my wives JK. 295/70/17 would make a good replacement size for the 305/70/17 we run on her JK now. Cooper/MickeyThompson have really started to impress me with their tread designs and nearly bomb proof strength. The choices today in top quality tires makes it three times as hard as it was a decade ago to pick a tire.
 
#8 ·
Completely agree.

The 305 KM2's were on my list, is there a reason you would not put them back on?
 
#7 ·
The Cooper ST is a great tire. Hopefully the ST Pro is even better. However, at first glance it looks like the void ratio may have gone slightly which means the tread may be more moderate to increase sales not traction.
 
#15 ·
Crap, I just saw that these are E rated in 35s...not what I want for conforming on rocks or a compliant highway ride. Good for trucks, where I am sure 95% of their sales will be. I'm with the MTRs now, waiting to find out more about the KM3s.
 
#19 ·
#21 ·
They look a little like a DT but with a little more voids on the side. I like them and will look at them when I'm ready. Too bad most of them are E rated tho which is why I'll probably look to go to a 15" rim.
 
#22 ·
I was just looking at these again. The weight (67 lbs) seems awful low for an E-rated 3-ply-rated-sidewall tire, does it not? The C-rated MTRs are around that exact weight in 35". I have read that Cooper tends to be optimistic with their weights. Will see if I can find someone to weight the one closet to 35s in 17.
 
#23 ·
So I checked with a local shop since Cooper has a reputation of understating weights (I have also called them with the same experience). The guy I called is a local Jeeper and specializes in tires (worked at Discount for years). He says he recalls the all weighing around 74 lbs. That makes sense to me with the E rating and 3-ply sidewall. The weight also is almost exactly like the Nitto Exo and the Toyo RT. Unfortunately all too stiff/heavy for me so the wait goes on. :(
 
#24 ·
That stinks.. I'm working with Discount right now on a tire and wheel package and they asked me to consider this tire. I was also weary of the "E" rating and now that I hear the weight its even more of a turn off.

Back to either KM2's or maybe even P3's. This tire decision stuff stinks and I'm getting tired of doing hours of research.
 
#25 ·
I guess it may not be a big deal but I don't want a much heavier tire. I have heard that BFG is coming out with the KM3 and I really want to know more about it before I pull the trigger. Nobody knows anything about it. I called BFG and the rep claimed to have no idea- which may be true since they are probably keeping it quiet if this is a legit rumor.

Any idea how much the ATZ P3 weighs in 35? I may call them to see what they say. I'm guessing 68 lbs since it is D rated. The MTRs are around 64.

EDIT-their website says 65 lbs. I missed that the first time I looked. If true, that is good- probably means that the tread is not super thick and super heavy.
 
#27 ·
It look promising but without actual tests, I'd like to see how tough that sidewall actually ends up being. I can roll these MTRs for a while longer.
 
#32 ·
The MTR Kevlar....maybe the KM2 (discontinued or no stock, I believe) but maybe the KM3 if it materializes. Oh, definitely the KO2...almost forgot about that one.
 
#34 ·
Those are 66-67lbs, only a few pounds lighter than the 72lb heavy ones... Not like Duratrac's light. All E's and 3ply, I agree probably tougher until we have further information on the Cepek's. I have never had a trail flat (beating my fist on my wood table right now) even when I was running C's. So I think I am good with a 2ply E tire...

MT'R's can be such a bitch to keep balanced and have even wear though, not my style. Too much road use I guess...
 
#33 ·
Ah, the KO2 in 35 is E rated and hits 66.5 lbs. I still consider that light though the 35" may run small. In 35", I'd like to stay under 70 lbs. With my 4.10s and 35" MTRs, it is just about bearable up the mountains.
 
#35 ·
Yeah, I would not run DuraTracs on the Jeep...too thin of a sidewall...tread is fine. I do on the 4Runner. I agree about the MTRs- my bad one is the spare. I am lucky in that I mostly work from home now and no longer have a commute, but on the Moab and Ouray trips, it would be nice to have a slightly smoother and quieter tire. I'll keep an eye on these.

The Goodyears are still pretty light at 64 lbs in 35 and maybe 67/68 in 37. They can be hit or miss...which is why I am looking for other options when I switch these out. Maybe they have just become louder as they have aged but I notice them more now.
 
#37 ·
Quick question, I know the STT Pro is brand new, but was the former STT 285/70r17 a true 33" tire when mounted on your JK? I know rim size is important, so let's say 7.5" wide, the smallest available that you can mount these on, and also, factory rim width

Also, do you think these tires are heavy enough where I should look into getting c gussets?
 
#38 ·
No tire is truly what it measures when mounted with the weight of the vehicle on it. My 33s really measure about 32" on the Jeep. The stock 32"s were really barely 31" tall
 
#41 ·
Axle upgrades- no need with 33s. C-gussets are not that expensive and good insurance if you are wheeling. Just make sure you use someone who knows how to weld and how to keep things cool while welding...random people don't know how to do this. I used a local hack (who pretends to be a Jeep mechanic in the Colorado Springs area) to weld my Cs on my 2012 JKR. I ended up with some warping and a permanent caster difference. The welds were terrible too, and that is hard to remedy. So not a bad idea to at least get some Teraflex gussets welded on. I used the EVOs last time and prefer the thicker yet leaner Teraflex ones, though I know both work well.
 
#45 ·
Thought I would try to help with the tire weight question.

Based on the Cooper web site, the ST Pro is very similar to the ST Maxx. If I am interpreting correctly, they are of the same (or very similar) construction with the major difference being the tread design.

I have the Cooper ST Maxx 295/70/17 and pulled the spare to measure the weight.

The combined wheel/tire weight was 88 lbs. The wheel weight is 23 lbs (based on the manufacturer's web site), and there is just over 8 ounces of balance weight.

This leaves a net weight of 64.5 lbs. for the tire.

There is another data point (reference an earlier post in this thread) which indicates the measured weight for the ST Maxx at 255/80R/17 is 58 lbs. I think one could extrapolate a good estimate of the 35" tire from these data.
 
#46 ·
Treaddepot says your tire weighs 66lbs, so that's really interesting. It's slightly lighter than published.
 
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