Cooper ST/Maxx review - 235/85/r16 - First Gen. Tacoma

Clawhammer

Adventurer
I thought I'd post a little review information for anyone who's interested in running this tire, or this tire size on a smaller 4x4, since there's not just a whole lot of info out there.

I've got an '04 Taco with 120k or so on the clock. It's got a 2" OME lift and when I went to buy new tires, I decided to go with 235/85's (mainly because I like the "utilitarian" look, but the price didn't hurt) instead of the 265/75's I had before. The Cooper's had good reviews, aggressive tread, and a decently long mileage rating, so I went with them.

Now, I had a few bad experiences out of the gate. First off, the tire shop had trouble getting them balanced. After a couple tries, it's pretty good, very livable, but not perfect. Ok, I can deal with that. Secondly, the tires initially felt a little "splashy." It's hard to describe, but in sudden evasive maneuvers, the truck wouldn't feel planted to the road, if you know what I mean. I think this was due to the taller sidewall giving some flex that I'm not used to. Anyway, this seems to have gone away after about 3,000 miles and they feel better now. The tire shop initially had about 48 lbs of pressure in my tires (!) and the handling was awful. I lowered things to about 34 lbs, and found it much more to my liking. That's about all I can say bad about this tire/size. Onto the good...

I took off from Ohio on I80 headed toward Colorado a couple weeks ago. At 80mph the tires did fine, some road noise and some vibration, but nothing I'd be concerned about from an off-road-ish tire. I ran several passes and Jeep trails out there and I have to say, these tires took them like a champ.

I ran Gore Pass first, which is pretty mild but did have a few moderate parts. I never lost traction, and although my engine did seem to strain a bit at higher elevation on some of the steeper grades, I made it over fine. Next up was Weston Pass near Leadville. Once again, this was a fairly mild trail and I didn't have trouble getting traction. I also ran Big Union Gulch, Trough Road, Homestake Creek (up to Holy Cross where the trail got wild and I turned back) and a handful of forest service roads and was pretty impressed overall.

Hagerman Pass had opened the day before I got to it, and i knew that although this trail is rated as moderate, it was going to be a little tough this early in the season. There were washouts, ruts, water crossings (I need to lube my leafs now, they're squeaking like crazy after driving though the water!), very rocky sections, some mud, some fairly deep mud, and of course, snow at the pass. I also rain some of Mosquito Pass, but decided to turn back where there was a series of mangled culverts that I was concerned could slice a tire. Mosquito Pass was roughest of any I ran, but I only did a portion of it.

Through it all, the tires stuck and I made it out just fine. I should point out that I don't have a rear locker, and I did not air down. Granted, I probably should have aired down, but not having a tire pump with me, I decided to take my chances. I did gear down often, of course, though I never felt the need to go to 4L. I have to say, if you can adjust to some handling differences while you wait for the tires to break in, I think the Maxx's will serve you pretty well.

Just though I'd share in case it would help anyone out. Travel safe!
 

bijanjames

Adventurer
Why would you not use your low range...? It's there for very important reasons, which if you're posting on this forum you should know. Please don't be offended by my comment, but four wheeling, especially in my neck of the woods, at those altitudes, in hi range, is ridiculous...
 

Clawhammer

Adventurer
Fair enough, and I don't take offense.

I didn't use 4L because I never needed it. I got wherever I was going just fine in 4H. I've always found that driver ability and tire placement are the most critical factors.

Anyway, I mainly made this post to report my experience with a tire that I had considered for a long time but found inadequate info about.
 

Robert Bills

Explorer
Thanks for the review.

The "squishiness" you reported during the first few thousand miles has been mentioned before in connection with these and other tires during break-in and is not atypical.

As far as tire pressure is concerned, you might look at the Tire and Rim Association load inflation tables and try the pressure indicated for your LT235/85R16 tires and the weight of your vehicle. You can start with the published curb weight (3,300-3,500 lbs.??) or stop by a public scale if you want a more accurate number. According the the chart, a good starting pressure would be 35 psi, which provides a load carrying capacity of 1,700# per tire, 40 psi, which provides a load carrying capacity of 1,870# per tire, or someplace in between. See https://toyotires2-1524598101.netdn...ication_of_Load_Inflation_Tables_20151020.pdf

From that point, do the "chalk test" to confirm an even wear pattern at your chosen tire pressure. Load your rig with typical gear and a full tank of gas, run a stripe of sidewalk chalk across the entire width of the tread on each tire, and drive slowly on even, level pavement until you can see a wear pattern (50 ft more or less). If the chalk wears evenly you are good to go. If the chalk wears only in the center, let a bit of air out. If if wears at the edges, add air. Experiment until you find the perfect pressure front and rear.
 

WyoCherokee

Adventurer
Love these tires. They have awesome grip, just wait till you air down. And the Armortek sidwall really helps out a low pressure. While running around Moab, i kept my tires at 15 PSI even while commuting through town, up to Arches, out to Dewey Bridge, and they never got hot or felt out of control. normally i wouldnt go for a 10 ply tire on a 3500 lb vehicle, but these run great on my jeep and i have zero complaints.
 

Clawhammer

Adventurer
Thanks for the review.
The "squishiness" you reported during the first few thousand miles has been mentioned before in connection with these and other tires during break-in and is not atypical.

From that point, do the "chalk test" to confirm an even wear pattern at your chosen tire pressure. Load your rig with typical gear and a full tank of gas, run a stripe of sidewalk chalk across the entire width of the tread on each tire, and drive slowly on even, level pavement until you can see a wear pattern (50 ft more or less). If the chalk wears evenly you are good to go. If the chalk wears only in the center, let a bit of air out. If if wears at the edges, add air. Experiment until you find the perfect pressure front and rear.

Thanks, Robert. I've been meaning to do a chalk test, but didn't get around to it before I took off. From the charts I saw online, 34-38 psi seemed to be the best pressure and 34 felt better from the driver's seat, so I went with it. Maybe now that they're broken in a little more, I could bump it up a touch. Good link, btw!

Love these tires. They have awesome grip, just wait till you air down. And the Armortek sidwall really helps out a low pressure. While running around Moab, i kept my tires at 15 PSI even while commuting through town, up to Arches, out to Dewey Bridge, and they never got hot or felt out of control. normally i wouldnt go for a 10 ply tire on a 3500 lb vehicle, but these run great on my jeep and i have zero complaints.

Good to know, Wyo. One of these days, when money isn't quite so tight, I'll get an ARB locker and some on-board air and then airing down will become a common practice. Not doing so was basically a compromise out of practicality. How many miles do you have on your treads?
 

WyoCherokee

Adventurer
Thanks, Robert. I've been meaning to do a chalk test, but didn't get around to it before I took off. From the charts I saw online, 34-38 psi seemed to be the best pressure and 34 felt better from the driver's seat, so I went with it. Maybe now that they're broken in a little more, I could bump it up a touch. Good link, btw!



Good to know, Wyo. One of these days, when money isn't quite so tight, I'll get an ARB locker and some on-board air and then airing down will become a common practice. Not doing so was basically a compromise out of practicality. How many miles do you have on your treads?

about 15,000 miles. there is noticable wear but they still look nearly new aside from some rock marks. I am running a Viair 450P. Got it on Amazon for $275. I like it because i can bring it with me in multiple vehicles. It will air up a trailer tire from 10PSI to 60 PSI with full load on the tire in about 2.5 Minutes.
 

Robert Bills

Explorer
FYI re tire wear:

I typically rotate and re-balance my ST/Maxx tires every 4,000 miles. I measure tire tread each time. I have 12,000 miles on mine now and remaining tread depth suggests that I should get 33,000 miles from them before the tread gets down to 4/32, which is when I typically replace tires. Not bad for a tire with aggressive tread used offroad.
 

bijanjames

Adventurer
Thanks for the review. Great tire. I have about 11,500 on mine, I'm rotating 5 and are wearing very well. Should see about 40,000 miles.
 
I have the 235/85-16 ST Maxx on my 2nd gen Tacoma. They fit with no lift, OE wheels, and have worked well for me. They did surprisingly good in the one snow we had this year. They also did fine in the surprise packed and icy ski trip that was supposed to be dry pavement late in the season.
 

01tundra

Explorer
I have the exact same tires on my 1st Gen Tacoma 4-door.

Hands down the absolute best dual-purpose tire I've ever ran, so good that I will be replacing them with the exact same thing whenever they finally wear out and we're getting ready to replace the Duracraps on our FJ with S/T Maxx as well. I've ran several different sizes and a majority of the popular brands of MT & AT tires out there and none can compete IMO for an all-around tire on a daily driver.

Mine currently have 47k miles on them and still over 7/32" of tread. We live on a rough gravel road and I haven't been the best about rotations (upwards of 7,500 mile intervals at times....). They still balance out smooth, are quite and grip well. I'll easily get over 50k miles out of this set.

I typically run 38 psi on the street and about 15 psi off-road. Truck weighs around 4,500 lbs.
 
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