I've had 2 sets of the old STT's and now have a set of the ST MAXX's fitted! I was really happy with the STT's but Have to say that I'm not really sure what to think of the STT MAXX's at the moment. Between My Nissan Patrol and my friends Land Cruiser we have 12 of these tires and so far we have had 3 failures - unexplainable splits appearing and spreading rapidly! Absolute failure guaranteed with this type of split..
To Coopers credit they have replaced the first 2 and we are in discussions regarding the third.
All three tires split in the same location on the casing! All three failed between 10 000 and 20 000 km after installation.
I had to replace 1 in Moscow which wasn't the easiest task. the other tires on my vehicle seem to be going ok - so far so good!
I'm a long from Australia where I originally purchased them and at this stage I'm not sure if the manufacturer will be able to offer any suggestions as I'm not in the country where they were purchased!
We are in the UK at the moment waiting out the winter, as we are heading back to Europe and hopefully a stint in Morocco before heading toward the US and South America over the next couple of years, I'm considering changing over to BFG's whilst I'm here! Don't need the added stress of chasing after tires in Morocco or other such places if I have any more fail!
I'd be interested to hear if anyone else has had similar failures!
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They have been exposed to some fairly hard work but nothing beyond what my previous Coopers have had to contend with, and not a lot of rough gibber stone driving which is what I would expect in Australia - that can be hard on sidewalls.
Overall I'm very happy with the tire wear but unexpected sidewall failure is not acceptable, I hope they can sort it out if its a manufacturing fault.
Cooper have been a great and reliable tire for a long time, maybe we just got a bad batch! But you have to have confidence in your wheels..
cheers - Justin -
www.globatrol.com