Attention: TDR Forum Junkies 
This is an update to my previous thread asking for advice/experience with Cooper tires (https://www.turbodieselregister.com/threads/anyone-have-experience-with-cooper-stt-pros.269797/). I like to read updates/resolutions so I thought I would post one, especially for everyone who was kind enough to post on my original thread. I decided to go with the AT3 XLT's like most you you suggested in my last thread. Even though I had originally wanted to go with a more aggressive tread, everything that I read about these tires told me that, unless I was going to be doing some off-roading in extreme conditions or really deep snow, these were the ones I needed. The 60K mile tread life warranty helped too. So I called my tire shop (ironically they are the local Goodyear retailer) and ordered a set. I went with 315/70R17's. I wanted the extra height and I have a 2" leveling kit, so I didn't think it would be a problem.
Last Wednesday, I went and had them installed and I asked the tire shop to use the Thuren Fabrication alignment specs, which they did. I also spec'ed 50 psi for the front tires and 40 psi for the rear tires. I very rarely ever tow anything and when I do it's not something of substantial weight. I do haul a good bit, but I'd say that about 90%+ of what I haul is 1000 - 1500 lbs or less. Again, after doing a lot web crawling and reading, I didn't feel that I needed to be running my tires at max pressure any more just to appease the TPMS. In the week or so leading up to getting my new tires, I experimented with different pressure settings and settled on 50 psi for the front and 40 psi for the rear. It definitely smoothed the ride out (the rear end didn't seem as bouncy as it used to be) and even gave me back a bit of grip on the worn Goodyear Wranglers I had on. I used Alfo OBD and my OBDLink MX+ to reset the TPMS pressure settings. I did have to get my truck's PIN code to do it. I know that there has been much discussion on here and other forums about that. I didn't have an issue getting the PIN from my dealer, though the parts guy made it seem like he was doing me a favor by even giving it to me. Whatevs! I got the spiel that it might only be good for 12 hours or a one time use code, but I found that to not be true. I did my first TPMS adjustment within a few hours and getting the PIN and did another 3 days after that and the same PIN still worked. At this point, I am VERY pleased with these Cooper tires and the setup that I am using. They are everything that you all said they would be. They are quiet, give a very smooth ride, and with the alignment that was done my truck handles like a dream. I can't wait to try them out in various road conditions. The Wranglers that I had were good road tires for most conditions, but they fell pretty flat on even mild of-road conditions. I don't think that I will have that problem with these Coopers. One thing I will say is that the handling doesn't seem squishy at all. I know that this was a complaint from some folks when their AT3's were new, but I feel that running the lower pressures suited to my towing/hauling style helped that a good bit. As for rubbing with 315's, I do notice a very slight rub at full lock, but I'm not sure the tires are hitting the control arms or the front mud flaps (I'm betting on the mud flaps). When backing on terrain with the back end higher than the front end, I do get some rubbing that is definitely mud flaps (had the same issue with my 285 Wranglers too). The front mud flaps are either going to get trimmed or removed altogether.
Lastly, I did experience an issue in all of this, but not with the tires. It was with resetting the tire size in the BCM so that I would get accurate speeds/fuel mileage. The day after I got the tires, I used Alfa ODB to reset the tire size. The size of my tires was not on the pull down menu so I used the option to enter the tire's circumference (in millimeters). After getting the tire's diameter (as mounted on my truck) and doing the necessary math, I arrived at 2663mm for the tire circumference (the factory setting was 2480 according to Alfa OBD). I entered that in and it seemed to accept it. However, when I started my truck the next morning the EVIC lit up like a Christmas Tree. Some of the information I was able to get was something about the tire size being set to an impossible setting, but there was a lot of other stuff as well. I ended up taking it to the dealer. I was pretty much expecting the worst and convinced that I had bricked my BCM. Fortunately, that wasn't the case. They reset the BCM and now it's okay. The reset didn't seem to affect my TPMS settings any (at least it seems that the RF hub wasn't reset due to all of this), but I will double check the TPMS settings in the BCM to be sure. They only charged me an hour's labor (plus the associated fees). They told me that the 315's I have are an unsupported size and that using that tire size screwed up a lot of other BCM functions. That makes sense to me, but it doesn't make sense that there is a size limitation. The tech told me that 285's were the biggest tire size supported by the BCM and that is what he set it to. Then again, this same tech proceeded to try and tell me that the 315's were out of spec for the load my truck could carry (let alone with the pressures I had them set at). In talking with him, (a younger guy), he was confusing the speed rating with load rating. SMH! So I schooled him on that a bit along with with why I had the tire pressures set the way that I did. I'd be very interested in hearing opinions on this tire size limitation. Is this just a 2013 thing, is it a 2500 thing, or is it both? None the less, I can live with the tire size setting for 285's. When I was running 285's I never reset the tire size diameter and it really didn't seem to make a lot difference with speed or mpg's.
Anyway, I apologize for the long post/update, but here are some photos. I wasn't able to get the tires and wheels detailed because of weather and it being at the dealer all weekend, but the tires still look really good on my truck.
-Tim
2013 Ram 2500 Laramie QC LB 4x4, Thuren Fabrication adjustable track bar, sway bar kit, and 2" leveling kit, Bilstein 5100 shocks, Westin Chrome Ultimate Bull Bar, Weatherguard Saddle Box, Line-X Bed Liner, Cooper Discoverer AT3 XLT's LT315/70/R17
P.S. Yes, as you can see from my photos my neighbor, Clark Griswold, has his Christmas lights up already and yes, you can see that his mania has infected my wife as well. SMH!
Last Wednesday, I went and had them installed and I asked the tire shop to use the Thuren Fabrication alignment specs, which they did. I also spec'ed 50 psi for the front tires and 40 psi for the rear tires. I very rarely ever tow anything and when I do it's not something of substantial weight. I do haul a good bit, but I'd say that about 90%+ of what I haul is 1000 - 1500 lbs or less. Again, after doing a lot web crawling and reading, I didn't feel that I needed to be running my tires at max pressure any more just to appease the TPMS. In the week or so leading up to getting my new tires, I experimented with different pressure settings and settled on 50 psi for the front and 40 psi for the rear. It definitely smoothed the ride out (the rear end didn't seem as bouncy as it used to be) and even gave me back a bit of grip on the worn Goodyear Wranglers I had on. I used Alfo OBD and my OBDLink MX+ to reset the TPMS pressure settings. I did have to get my truck's PIN code to do it. I know that there has been much discussion on here and other forums about that. I didn't have an issue getting the PIN from my dealer, though the parts guy made it seem like he was doing me a favor by even giving it to me. Whatevs! I got the spiel that it might only be good for 12 hours or a one time use code, but I found that to not be true. I did my first TPMS adjustment within a few hours and getting the PIN and did another 3 days after that and the same PIN still worked. At this point, I am VERY pleased with these Cooper tires and the setup that I am using. They are everything that you all said they would be. They are quiet, give a very smooth ride, and with the alignment that was done my truck handles like a dream. I can't wait to try them out in various road conditions. The Wranglers that I had were good road tires for most conditions, but they fell pretty flat on even mild of-road conditions. I don't think that I will have that problem with these Coopers. One thing I will say is that the handling doesn't seem squishy at all. I know that this was a complaint from some folks when their AT3's were new, but I feel that running the lower pressures suited to my towing/hauling style helped that a good bit. As for rubbing with 315's, I do notice a very slight rub at full lock, but I'm not sure the tires are hitting the control arms or the front mud flaps (I'm betting on the mud flaps). When backing on terrain with the back end higher than the front end, I do get some rubbing that is definitely mud flaps (had the same issue with my 285 Wranglers too). The front mud flaps are either going to get trimmed or removed altogether.
Lastly, I did experience an issue in all of this, but not with the tires. It was with resetting the tire size in the BCM so that I would get accurate speeds/fuel mileage. The day after I got the tires, I used Alfa ODB to reset the tire size. The size of my tires was not on the pull down menu so I used the option to enter the tire's circumference (in millimeters). After getting the tire's diameter (as mounted on my truck) and doing the necessary math, I arrived at 2663mm for the tire circumference (the factory setting was 2480 according to Alfa OBD). I entered that in and it seemed to accept it. However, when I started my truck the next morning the EVIC lit up like a Christmas Tree. Some of the information I was able to get was something about the tire size being set to an impossible setting, but there was a lot of other stuff as well. I ended up taking it to the dealer. I was pretty much expecting the worst and convinced that I had bricked my BCM. Fortunately, that wasn't the case. They reset the BCM and now it's okay. The reset didn't seem to affect my TPMS settings any (at least it seems that the RF hub wasn't reset due to all of this), but I will double check the TPMS settings in the BCM to be sure. They only charged me an hour's labor (plus the associated fees). They told me that the 315's I have are an unsupported size and that using that tire size screwed up a lot of other BCM functions. That makes sense to me, but it doesn't make sense that there is a size limitation. The tech told me that 285's were the biggest tire size supported by the BCM and that is what he set it to. Then again, this same tech proceeded to try and tell me that the 315's were out of spec for the load my truck could carry (let alone with the pressures I had them set at). In talking with him, (a younger guy), he was confusing the speed rating with load rating. SMH! So I schooled him on that a bit along with with why I had the tire pressures set the way that I did. I'd be very interested in hearing opinions on this tire size limitation. Is this just a 2013 thing, is it a 2500 thing, or is it both? None the less, I can live with the tire size setting for 285's. When I was running 285's I never reset the tire size diameter and it really didn't seem to make a lot difference with speed or mpg's.
Anyway, I apologize for the long post/update, but here are some photos. I wasn't able to get the tires and wheels detailed because of weather and it being at the dealer all weekend, but the tires still look really good on my truck.
-Tim
2013 Ram 2500 Laramie QC LB 4x4, Thuren Fabrication adjustable track bar, sway bar kit, and 2" leveling kit, Bilstein 5100 shocks, Westin Chrome Ultimate Bull Bar, Weatherguard Saddle Box, Line-X Bed Liner, Cooper Discoverer AT3 XLT's LT315/70/R17
P.S. Yes, as you can see from my photos my neighbor, Clark Griswold, has his Christmas lights up already and yes, you can see that his mania has infected my wife as well. SMH!
