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post #1 of 17 Old 07-02-2014, 07:59 AM Thread Starter
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Cooper STT's

I have these in 35's and they are a bit under 35. Does anyone have these in 37's for a 15 inch wheel? If so, what do they measure out to mounted on the Jeep? Thanks

2008 JKU Rubicon. 2.5" Rock Krawler Stock Mod lift, 35x12.50x15 Cooper STT's on Pro-Comp D-windows, 5:13 gears, Uconnect Microphone mod, Husky Floor Liners, Mastercraft Grab Handles, Weathertech Side Window Deflectors, Hitch mounted D-Ring, Rancho Oil Pan Skid, Skid Row Evap Can Skid, and a Rugged Ridge Front Skid. Solid Diff Covers front and rear. Rock Slide Engineering Sliders.
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post #2 of 17 Old 04-12-2015, 06:39 PM
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You haven't received a reply, so I hope I can ask you a question:

How are you liking your STT's? On pavement? Off pavement? Noise, mileage, overall handling? What tire pressure are you averaging?

Thanx
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post #3 of 17 Old 04-12-2015, 08:21 PM
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Ok there not 15 in wheels but on 37 13.5/17 i love them went from bfg km2s 35 12.5/15s they are a true 37 there not loud at all no funky handling issues and balanced perfect.im at 26 lbs of air pressure could go down to 25 as the chalk line on outer lugs still present (barely) after 30 miles.the ride is good not as good as the bfgs as they were c rated these are d. I think there one of the better choices being you can get them in a 13.5 wide. Not sure how they work off road yet.As for mileage it's about the same. Hope this helps..
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post #4 of 17 Old 04-13-2015, 06:15 AM Thread Starter
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Quote:
Originally Posted by Owl View Post
You haven't received a reply, so I hope I can ask you a question:

How are you liking your STT's? On pavement? Off pavement? Noise, mileage, overall handling? What tire pressure are you averaging?

Thanx
They're still good after almost 40k. Still not too noisey, just like any MT they must be rotated regularly. I skipped a winter on the rotation schedule and they're still fine. Very nice off road, good in the deep snow not so much on the ice but nothing is good on ice...

2008 JKU Rubicon. 2.5" Rock Krawler Stock Mod lift, 35x12.50x15 Cooper STT's on Pro-Comp D-windows, 5:13 gears, Uconnect Microphone mod, Husky Floor Liners, Mastercraft Grab Handles, Weathertech Side Window Deflectors, Hitch mounted D-Ring, Rancho Oil Pan Skid, Skid Row Evap Can Skid, and a Rugged Ridge Front Skid. Solid Diff Covers front and rear. Rock Slide Engineering Sliders.
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post #5 of 17 Old 04-13-2015, 12:15 PM
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Quote:
Originally Posted by Victim Of Pain View Post
They're still good after almost 40k. Still not too noisey, just like any MT they must be rotated regularly. I skipped a winter on the rotation schedule and they're still fine. Very nice off road, good in the deep snow not so much on the ice but nothing is good on ice...
Thanks for the reply. Giving serious consideration to these.
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post #6 of 17 Old 04-13-2015, 04:52 PM Thread Starter
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Quote:
Originally Posted by Owl View Post
Thanks for the reply. Giving serious consideration to these.
Pretty affordable if you've got 15's too. Think I paid $230 per tire.

2008 JKU Rubicon. 2.5" Rock Krawler Stock Mod lift, 35x12.50x15 Cooper STT's on Pro-Comp D-windows, 5:13 gears, Uconnect Microphone mod, Husky Floor Liners, Mastercraft Grab Handles, Weathertech Side Window Deflectors, Hitch mounted D-Ring, Rancho Oil Pan Skid, Skid Row Evap Can Skid, and a Rugged Ridge Front Skid. Solid Diff Covers front and rear. Rock Slide Engineering Sliders.
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post #7 of 17 Old 04-19-2015, 06:58 AM
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On the subject of the Cooper Discoverer STT M/T for OWL (
Quote:
Originally Posted by Owl View Post
You haven't received a reply, so I hope I can ask you a question:

How are you liking your STT's? On pavement? Off pavement? Noise, mileage, overall handling? What tire pressure are you averaging?

Thanx
:

I have accrued over 20,000 on a set of 315/75r16 "E" rated STTs
with a rotation of all 5 @ each oil change (3000 miles) intraval , they are at approximately 65-70% tread left and superb off road on rocks - big , nasty granite/flint/limestone rocks - , mud , gravel & dirt/snow. Noise in minimal.
They are absolutely well balanced with the worst being at around 8-9 oz of weight required. Initially, they were chosen in this "E" rated , overkill size for my JKUr which with all off road gear packed, weighs 4800 lbs. The "E" rated 315/75r16 ( I recall 34.68 initial measurement) was chosen for the tri-guard sidewall protection and took about a half year until it softened up . I drive at 28.5-30 psi highway for a few extra MPGs ( I run non-ethanol only in 89-90 grade ) stretched out on trips. With the Superchips FlashPaq this improved by another few MPG ending in my getting about 18-21 HWY /14-15 city mileage.

They are heavy and the durability has surprised me endlessly with its ability to fold over itself and take abuse at my offroad PSI ( 8- 12 psi depending upon terrain) on non beadlock Level8 strike 5s . Together,they come in at just under 96lbs per wheel/tire in this combination.

Would I refer someone who offroads in the S.E. US a set of these if they want 35s? Heck yes. They are good-to-great on road* and excellent offroad.
They have good wear tendencies and you could get a set to last 30k-40k before being in need of replacing. Keep in mind, I have a bit of an OCD weight self-restriction issue in-that I never wished my 4 door to exceed over 5000lbs. I worked very hard to get the weight down from stock and build the Jeep up with many aluminum parts to get it under 5000lbs while still being very well protected ( $) but the primary "issue" I can report after 20,000+ miles on the STTs is that as they have worn to about the size of a 33"-34" tire . Thus, they don't fill the trimmed stock fenders of my wheel well & my 3" Synergy Stage II lift . They have the look of being too small now. I had always planned on upgrading to Coopers 325/80r16 but they have discontinued that 36" model.

Plus, I want the slightly higher clearance achieved by 37s ( yes, I have been in spots where an extra inch of tire would have allowed me to make it without skid-plate dragging) . So, before this set gets so used ( abused) that I cannot get anything by selling them , I have been doing homework and can get the same wheel in a 17" with 4.50 BS and 5-5.0 bolt pattern ( btw: the Level 8 strike 5s are a great light-weight cheap Chinese wheel) instead of my 16"s with a set of the new BFGoodrich KO2 in a 37"x12.50.17" "D" rated size that will only weigh 5lbs more per corner than my 35's . I hope to be able to sell my 35" STTs and wheels to recoup a bit of the money on the new upgrade but it isn't required.


I figure someone in my vicinity with stock wheels and tires will want to move to 35's and these were a fabulous first upgrade as I ran these initially with just the TeraFlex levelling kit and an extra 1" spacer upfront to eliminate rake.


(* the only places I will give a negative input on STTs are
(a) they do not exceed well in in icy conditions of under 1/2" ; more ice or snow and they are fine. Under that amount & they struggle to maintain grip.

(b) when it is misting or the asphalt is just slightly wet- not a deluge , where they are fine- just very a light misting of H2O and they are like they are on ice.I have wound up inverted 180 degrees around by taking low speed 90 degree left hand turn at an intersection ( I have a 3.8l) and pucker factor 09 kicked in as I was facing traffic I was previously in front of. take off from 2nd gear prevents this torque overshoot & backend swing around....finally,
(c)the siping is perfectly fine up until 15,000-20,000 miles; then the middle block sipes begin to wear and they do not go all the way to bottom of the knobbies so I had to "enhance" the existing sipes - I did not have to go so far as getting a tire groover/siper but instead found that very consistent use of a dremel cut-off wheel for metal re-establishes the original siping and brought back the wet performance on-road. No, I did not hack-up my tires with a Dremel. I simply brought back the sipes in the locations that they originally were in & that were disappearing in middle of the tread blocks. Not more than 1/8" - 1/4" depth and afterwards, they were as grippy on road as they had been new.
)

I now realize that while durable, the "E" rated metric 35" ( 315/75r16) was slightly overkill for my rig and while great fun to not think about your tires at all while wheeling very hard obstacles, I think the D rated 37" KO2 will be more pliable when new and take less time to get broken in. Plus, they will be an All Terrain and suited for road as well as off road better and likely give me 40-50 K of life instead of 30-40k of the MT. My rig is 80% offroad ande 20% street /highway, I should have mentioned.

here is a sorta- decent image of my piggy w/ the Cooper STTs in 315/75r16 "E" rated after 2+ years and 22,000 miles of which 15-16,000 were street use. I now work from home so it is used for four road trips per year to Georgia from Tennessee and other than that it is for off road use.


another , upclose shot of the STT after 21k miles and hard off road use. Packed with Tennesse/Alabama red-clay-mud here....



<edit for forgotten info>
I failed to mention, if anyone likes this 315/75r16 combo with the Strike 5 wheels, there are fabulous package deals at DesertRat.com for these. Road Force balanced and mounted , delivered to door I think I paid just at $2000 with shipping for all five.
Discount Tire Direct may have similar/better/same type deal, but DesertRat was great to deal with. Just an FYI.


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Last edited by j3ff3ry_j33p; 04-19-2015 at 07:24 AM.
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post #8 of 17 Old 04-19-2015, 06:41 PM
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I've been running these in a 35x12.50x17 for over 25 thousand miles now and still have about another 10k left in em. Been a great all around tire, I usually rotate every 5k. My biggest complaint is actual size, I think they were closer to a 34 when new and at this point in life they just barely measure over 33. Not sure what I'll run next but I'm looking for a true 35 next go around. Leaning towards some nitto's atm.

Last edited by family4x4; 04-19-2015 at 06:43 PM.
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post #9 of 17 Old 04-30-2015, 06:50 AM
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Quote:
Originally Posted by family4x4 View Post
I've been running these in a 35x12.50x17 for over 25 thousand miles now and still have about another 10k left in em. Been a great all around tire, I usually rotate every 5k. My biggest complaint is actual size, I think they were closer to a 34 when new and at this point in life they just barely measure over 33. Not sure what I'll run next but I'm looking for a true 35 next go around. Leaning towards some nitto's atm.
^X2 on size: this was a 34.25" new and after a year the STT in metric size is about 33.5" MT. still a great, heavy @rsed tire....but run sorta smallish


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post #10 of 17 Old 05-01-2015, 08:13 AM
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Agree with the above 2 posts.

I have Poison Spyder fenders with a Teraflex 4" lift and the tires (315/75R 16) look like buttons. I measured with a tape recently as my Procal called for it and I must admit, I was pretty sad being at 33.25" barely.

In terms of on/offroad, great traction, haven't popped a bead and pretty quiet for an M/T tire on the road. I would would buy these again, just a bigger size (37").
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post #11 of 17 Old 05-01-2015, 04:24 PM
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Wonder what this tire really measures out to in a 37?? I would be tempted to run this tire again if the 37 came out around 35
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post #12 of 17 Old 05-01-2015, 08:05 PM Thread Starter
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Quote:
Originally Posted by family4x4 View Post
Wonder what this tire really measures out to in a 37?? I would be tempted to run this tire again if the 37 came out around 35
I think I started a thread looking for someone with these in 37's to report and got no reply.

2008 JKU Rubicon. 2.5" Rock Krawler Stock Mod lift, 35x12.50x15 Cooper STT's on Pro-Comp D-windows, 5:13 gears, Uconnect Microphone mod, Husky Floor Liners, Mastercraft Grab Handles, Weathertech Side Window Deflectors, Hitch mounted D-Ring, Rancho Oil Pan Skid, Skid Row Evap Can Skid, and a Rugged Ridge Front Skid. Solid Diff Covers front and rear. Rock Slide Engineering Sliders.
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post #13 of 17 Old 05-01-2015, 08:43 PM
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Lol, yeah I realized that was the whole purpose of this thread after I had posted that question. Although I am looking for the measurement on a 17, not sure if that will make any difference. Got to be someone out there with this tire in a 37 that could give some input.
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post #14 of 17 Old 05-02-2015, 09:06 AM
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37" Tires.

345/75 R16 BFG KM2 Radial -74lbs- 36.40"
385/70 R16 Nitto Mud Grappler Radial -90lbs- 37.72"
37x12.5 R16 Interco SSR Radial -90lbs- 36.90"
37x14 R16 Interco Irok Bias -71lbs- 36.90"
37x12.5 R16 Interco Irok Radial -89lbs- 36.90"
37x12.5 R16 Interco Irok ND -74lbs- 36.70"
37x13.5 R16 Interco M16 Radial -79lbs- 37.00"
13/38/16LT Interco TSL Bias -73lbs- 37.80"
37x12.5 R16 Interco Trxus MT Radial -79lbs- 37.20"
385/70 R16 Toyo Open Country M/T Radial -97lbs- 37.71"
37x12.5 R16 Maxxis Creepy Crawlers Bias -75lbs- 36.8"
37x13.5 R16 Pitbull Rocker Bias -74lbs- 36.45"
37x12.5 R16 Pitbull Rocker Radial -85lbs- 37.10"

37x12.5R17 Cooper Discoverer STT -74lbs- 36.2" Tread Width 10.2"

I found the above chart on another forum...might be of some help. The height of the tire is shorter by .7" compared to what Cooper advertises which seems about par for the course. Otherwise, I don't have any experience with the 37x12.5R17 STT.
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post #15 of 17 Old 05-03-2015, 01:54 PM
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That seems like a nice compromise, not quite a 37 but better than a 35. Wonder how necessary it would be to regear from my 4.10's?
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post #16 of 17 Old 05-03-2015, 06:17 PM
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I run the 35x12.5x17 cooper Discoverer STT they measured 34.750 new my 33" super swampers (bias) are pretty much the same size.
I like them but find them too quiet, and look small. should of went with a 37's.
with my fender setup I ran them with no lift (trailmods removable fenders) now with my clayton 3.5" premium lift

lol buttons


I put the small c on cooper cause it's a small tire.lol

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post #17 of 17 Old 05-26-2015, 08:15 PM
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I went with 37x13.50r17 STT's on my 2013 Ram and they measured out to 36.8" tall. Great tire on road, quiet and rides nice. No experience off road but I just ordered another set to go on my JK that I am building so I am hoping that they work good.


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