Cooper S/T MAXX are slippery - Dodge Cummins Diesel Forum
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post #1 of 13 (permalink) Old 01-23-2020, 01:08 AM Thread Starter
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Cooper S/T MAXX are slippery

Just wondering if anyone else experienced this with their Cooper S/T MAXX. Granted the weather can be wet every now and again this time of year but since I've had these tires on my truck I've felt like they just slippery. Or more slippery than anything else I've run on this truck. They'll skip on certain sealants on the road and change of pavement type roadways if I'm on the throttle too much. I've towed heavy with them too, and I'm just not certain if its me or if its the tire but they dont give a good sense of confidence. I didnt think the compound was terribly hard either but maybe thats all it is...


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post #2 of 13 (permalink) Old 01-23-2020, 06:11 AM
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Right after installation, I found the same; slippery when wet & liked to push on fast curves when given a bunch of throttle.

I called Cooper, and they emailed me a nice little chart for my tire size, with their recommended pressures for different axle weights.

Not expecting anything different, I adjusted pressures, and no more slipping/pushing.

Likely the most forgiving, all around tires I've used on a pickup truck, and definitely better than anything else I've had in 255/85R16.

FWIW, I believe the compound is soft, which is why it has deeper than usual tread depth to ensure decent tire life.

R12 in the summer, Webasto in the winter; cassette tapes & SAE-20078 all year.
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post #3 of 13 (permalink) Old 01-23-2020, 12:57 PM
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Got my 255/80/17's on my 2006 DRW Oct 29th Left for Nebraska 10th of Nov. around 12 pm That evening running I 80 around 7 pm to Laramie WY Black Ice Snow front aired to 50 psi rears 35 psi. Only drove about 40 mph up the steep climb to the plateau not a wiggle. Once up top had a Semi and Truck tangle up in front of me and went off the right side in a heap. Then after Cheyenne saw everyone coming to a stop so I ease in behind a Semi and stop next thing I know a F 350 goes shooting by me in the Median stops about 100yds up then a semi goes shooting by again same path as the F 350. And I am like what the Hell. So I let off the brake start rolling and hit the brakes hard and No hesitation just keep moving well heck Black ice. But I had no slide coming up behind the semi by putting gradual pressure on the brakes. Then later in Nebraska I have 2 Trucks come shooting from the West bound Lanes heading into my east bound lanes and just stopping barely into my lane and I did a quick lane change to the right not a wiggle. LOL a heck of a trip.

I will tell you I have never been so happy with my tires as Long as I did my part for the conditions they were unbelievable in handling all the conditions.
They did take about 200 miles to settle in as they were a little squirmy before my trip but since then they are the best I have ever had.

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Last edited by utahtrapper; 01-23-2020 at 01:00 PM.
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post #4 of 13 (permalink) Old 01-23-2020, 01:18 PM Thread Starter
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285/75 16 running 55-60 psi up front and 45-50 in the rear. Seems to be wearing evenly. Not sure why this would be too much psi for an E rated tire capable of holding 3700 lbs each.

'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's
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post #5 of 13 (permalink) Old 01-23-2020, 01:27 PM
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Happened to me as well. Dry day ,exit ramp off the interstate that loops around to an overpass. Front slid like I hit a patch of ice... Also the only set that I ever had a blowout with

2012 3500 Longhorn, EPA performance package.
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post #6 of 13 (permalink) Old 01-23-2020, 02:42 PM
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Right off the bat, every 285/75R16 I've run likes 1-3 psi less than 255/85R16s.

Think volume of air supporting the vehicle, rather than pressure.

In the case of the Cooper ST/Maxx, the stiff reinforced sidewall + softer tread compounds the issue.

I'm not sure why you're stressed about this, when I've mentioned earlier to call them for a chart that suggests different pressures for your tire model/size based on axle weights.

At some point, we have to take input from a manufacturer, and at the very least, try their suggestions.

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Originally Posted by KATOOM View Post
285/75 16 running 55-60 psi up front and 45-50 in the rear. Seems to be wearing evenly. Not sure why this would be too much psi for an E rated tire capable of holding 3700 lbs each.

R12 in the summer, Webasto in the winter; cassette tapes & SAE-20078 all year.
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post #7 of 13 (permalink) Old 01-23-2020, 07:55 PM Thread Starter
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Quote:
Originally Posted by ofelas.5z View Post
Right off the bat, every 285/75R16 I've run likes 1-3 psi less than 255/85R16s.

Think volume of air supporting the vehicle, rather than pressure.

In the case of the Cooper ST/Maxx, the stiff reinforced sidewall + softer tread compounds the issue.

I'm not sure why you're stressed about this, when I've mentioned earlier to call them for a chart that suggests different pressures for your tire model/size based on axle weights.

At some point, we have to take input from a manufacturer, and at the very least, try their suggestions.
I'm not "stressed" about anything other than the $1500 in tires which I feel kinda suck...

I've looked at their charts too and maybe I'll let another 10 psi out and see how they feel.

'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's
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post #8 of 13 (permalink) Old 01-24-2020, 02:22 AM
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My thoughts exactly when I first installed them; I was pleasantly surprised at what a difference a few psi made on these initially finicky but otherwise excellent tires.

R12 in the summer, Webasto in the winter; cassette tapes & SAE-20078 all year.
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post #9 of 13 (permalink) Old 01-24-2020, 11:05 AM
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different tire but from the same manufacturer; I put Cooper AT/3s on the '06 in the middle of a winter ~5 yrs ago. inflated them to what the old tires were (Michelin LTX, same size). I couldn't keep the rear tires from spinning out when engaging the clutch with no throttle. I was in 4 wheel everywhere. dropped 10 lbs off each tire in the rear and didn't need 4 wheel for the rest of the year!

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post #10 of 13 (permalink) Old 01-24-2020, 01:55 PM
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Did you decide to go with something other than LTX's for any particular reason?

R12 in the summer, Webasto in the winter; cassette tapes & SAE-20078 all year.
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post #11 of 13 (permalink) Old 01-24-2020, 02:10 PM
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I personally have had rotten luck with Michelin's weather cracking. my friend around the corner with a '92 used to run Michelins on everything and around the same time found the same bad luck with Michelin's. there was always plenty of tread left but the weather cracking got brutal and wouldn't pass yearly safety inspection for the yellow sticker.

Cooper's have not had any problems with weather cracking so far, but the tread compound did take some getting used to and adjustment of pressures as mentioned.

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post #12 of 13 (permalink) Old 01-24-2020, 08:29 PM Thread Starter
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I've had Michelins weather check on a couple different vehicles, completely different type of tire. Must be a Michelin issue...

'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's
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