154 9811 Toughest Tire On The Block - front Shot - Photo 29782040

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These tires were tested from Baja beaches to Rubicon rocks, some of which are shown here. With air pressure set at 18 psi, rocks-sharp, pointy, or round-presented little problem for the rugged Cooper tires. The Cragar aluminum wheels, however, took a pretty good pounding through the sluices.

Discoverer STTs offer deep shoulder lugs and a unique center traction zone that creates a bold, aggressive tread for superb traction, even in gumbo mud. The open design keeps the tread pattern clear while the tire's rotation slings away even the stickiest mud.

These tires were tested from Baja beaches to Rubicon rocks, some of which are shown here. With air pressure set at 18 psi, rocks-sharp, pointy, or round-presented little problem for the rugged Cooper tires. The Cragar aluminum wheels, however, took a pretty good pounding through the sluices.

A bit of showing off in Dry River Canyon in the Los Padres National Forest on a trash-pickup day. El Niño storms had toppled solid chunks of compacted soil from the high vertical cliff-face, which needed to be broken up, or future rains could create flooding from the water buildup.

Traction was so impressive with these tires, we were able to negotiate the entire Rubicon Trail with a USA VentureCraft TrailBlazer tent trailer in tow. Although, with the weight of the trailer and the 33-inch height of the tires, the Scrambler's six-cylinder engine and 4.10 gears were just barely strong enough to pull us up some of the steeper sections.

Cooper's blend of synthetic rubber with other compounds contributes to the STT's long mileage and durability. The ride control and flexibility of the STT's radial construction make these tires an excellent choice for mud/sand/snow/rock traction-all of which (except for the snow) were encountered on this trip along the Mojave Road, a National Heritage Trail.