It's the heavy duty carcass that makes the new STT so special. In a normal 4WD tyre there are rubber gaps between the sidewall cords. The rubber gaps are the weakest point of the tyre. A nail, a stake or sharp outback grass can push against the sidewall cord, deflect off and penetrate through the weakest point, (the rubber) and you get a flat. What Cooper has done is reduce the rubber gaps by taking its 2 ply STT and added a third ply on an angle (an 8 degree angle). It's called Armor-Tek3 technology and it's unique to Cooper.
The Cooper STT boasts even more strength than before due to an increase in denier cord strength used in the carcass construction. Cooper increased the denier cord strength from 1500 to 2000 denier. The STT now has 2 ply's at 2000 denier and the third ply (angled Armor-Tek3 ply) is 1000 denier. That's a whopping 25% increase in carcass strength!
Cooper has made the new STT even more damage resistant with a specially developed tread compound to help reduce the cutting, tearing and chunking commonly found with extended outback use.
A super traction tread employs a combination of features including deep sidewall lugs, notched and scalloped shoulder lugs, and a unique centre traction zone to create a bold, aggressive tyre. Sipes (tiny cuts in the tread blocks that squeeze out water from under the tyre) provide excellent wet bitumen grip for an aggressive traction tyre.
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"There was no question in our mind that the Cooper STT's were the right tyres for the job..."
We purchased our first set of Cooper STT's back in 1998 for a 10 week trip from Melbourne to Cape York and back. The tyres performed brilliantly...
"STT ArmorTek3's are the best tyres for Outback conditions"
I have just returned from a trip up north for the 2005 Outback Cattle Drive. I thought that I should let you know how impressed I am with the new...
"The new Cooper STT are absolutely astonishing !!!"
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