Cooper Discoverer S/T Maxx

[1stDeuce]

I don't think you can blame the pull on tread design... If that was the case, the tires would be pulling on everyone's ride, because we all have the same tread. There has to be something goofy about the carcass to make it pull like that, especially with the pull always being right, even after rotation. That almost has to be a ply thing. Lots of tires out there with the same tread and zero pull. Don't make no sense.

I can tell you my 255/85R16's don't pull at all. Pure speculation, but I wonder if Cooper figured out what was causing it and changed it... Anyone with a recently made set of tires experience any pull? (Like 2014 or newer tires?)

 

[1stDeuce]

Hmm. KojakJKU, you were running 285/70R17's if I recall correctly. I believe this is the same size that Redline is running, also with a right pull. Anyone else running that size care to report??

 

[landshark]

I had a set (275/65/20) a few weeks ago and they didn't pull. I ended up taking them back and getting another brand of tire as they killed my mileage and rode too stiff for my liking (E-rated).

 

[RubiconGeoff]

I had a set (275/65/20) a few weeks ago and they didn't pull. I ended up taking them back and getting another brand of tire as they killed my mileage and rode too stiff for my liking (E-rated).

Those 20-inch rims aren't helping your ride any. You might want to consider upgrading to some 17's.

 

[Redline]

Hmm. KojakJKU, you were running 285/70R17's if I recall correctly. I believe this is the same size that Redline is running, also with a right pull. Anyone else running that size care to report??

Nope, I'm running the 255/80R17 size.

The issue was not fixed... a buddy with an '07 Tacoma just bought five of the same, 255/80R17. Pull right on his Taco too, but we plan to adjust it away with caster, as I have done on my 4Runner.

 

[kojackJKU]

Redline, are your caster numbers different for right and left compared to when you where pulling? or did you just adjust both the same amount?

 

[Applejack]

Hey guys with your pulling issues, when convenient and safe to do so, drive in the left hand lane and see if your vehicle pulls to the left. If so that may counter the suggestions of alignment issues and you can almost certainly chock it up to the crown of the road surface and tread design, since roads are engineered with a crown on them for water runoff and some roads have more of a crown to them than others. While I can't say that I am pleased (they are just ok, IMO) with my set of ST Maxx's I have not encountered this problem...yet.

 

[Redline]

Hey guys with your pulling issues, when convenient and safe to do so, drive in the left hand lane and see if your vehicle pulls to the left. If so that may counter the suggestions of alignment issues and you can almost certainly chock it up to the crown of the road surface and tread design, since roads are engineered with a crown on them for water runoff and some roads have more of a crown to them than others. While I can't say that I am pleased (they are just ok, IMO) with my set of ST Maxx's I have not encountered this problem...yet.

Obviously the answers depend on the person, chassis, and conditions. For more on this subject there is an older thread with many posts by me about similar pulling caused Toyo M/T tires, a very common condition. Had pulling to right with Toyo M/T tires on my live-axle F-350 as recently as two years ago, but none with Maxxis Bighorns; same rig, same wheels, same tire size, same roads, same alignment settings...the tires matter that much.

In my case, and I'd assume most others, it's more than road crown. Driving in the left lane is not the solution and doesn't correct it. Depending on the treads, 1/2-degree of cross-caster can compensate for road crown, and I have different tires in my shop for the same chassis that need just that, 1/2-degree (they don't cause the chassis to pull/drift).

 

[Redline]

Redline, are your caster numbers different for right and left compared to when you where pulling? or did you just adjust both the same amount?

I prefer much caster on my rigs, I like the heavier steering wheel feel as well as the straight line tracking stability, regardless of the chassis. After suspension modifications, I like to return to the stock caster, or generally higher, drivability is critical for me. The few friends I've let drive my 4Runner (other rigs too) are impressed with how well it drives. I won't have it any other way.

The side to side caster setting ("cross-caster") are intentionally very different for the Cooper S/T MAXX treads currently in-use [but were only 1/2-degree different for the previous ******** Cepek Mud Country tires]. Through trial-and-error, on my chassis, with my tires and size, I found that a high, 2-degrees of cross-caster is good on the 4Runner.

Left caster 2.55-degrees Right caster 4.55 degrees

Drives great, no tire wear issues. I understand it's difficult to adjust caster on a live-axle rig, and not cheap, adding an off-set ball joint.

 

[Greg5OH]

I have these on my 06 f350 cclb 4x4 diesel in a 37. load range D but 3800 lb load rating. havetn had a chance to drive the truck much yet. I just hope htey are not squirmy and last a long time. I took the truck for a quick spin in 2wd through some hard packed snow, seem to grip alright

 

[kojackJKU]

My jeep pulled on my driveway. Its long so I can test this stuff. its a tire issue weather it be a tread issue, carcas issue etc.

 

[SSF556]

Just got 2 of the ST Maxx 255/75/17C to put on my trailer....will eventually put these on my Jeep when the DTs wear down...even as a C load they are heavy.

Weight wise...

 

[Hilldweller]

Pretty geeky of you, Scott. I'm proud.

 

[brianjwilson]

Just got 2 of the ST Maxx 255/75/17C to put on my trailer....will eventually put these on my Jeep when the DTs wear down...even as a C load they are heavy.

Weight wise...

Considering they are listed as 53lbs online, I'm actually impressed that they came in under that number. Weird thing is, their listed weight for a 255/80/17 E rates is 51lbs....

A lot of the sizes seem to weight less than a KM2 or toyo open county MT so I'm happy about that.

I see the duratrac in the same size is only 40lbs, wow, big difference. But that probably explains why I've seen so many people tear them apart off road.

 

[SSF556]

Pretty geeky of you, Scott. I'm proud.

I tried to bring one of them to bed with me last night...Susan did not approve....Luckie thought it was cool.


Sent from my iPad using Tapatalk