STI BLACK DIAMONDS ON
TRACK FROM COAST TO COAST
Granlund hangs it out at Speed World MX
in Arizona, which hosted Round 4 of the
2012 WORCS series. The STI Black
Diamonds and HD Beadlocks proved to be
the hot setup on this course’s varied
and changing terrain.
John Yokley kicks up some dust with his
Black Diamonds at the second round of
the GNCC UTV racing series in Union,
South Carolina. Photo by Ken Hill.
STI Tire & Wheel’s ultra-versatile cross terrain
radial tire, the Black Diamond, is proving to be
just as competent on race courses as it is on
rocks, mud, sand and snow. At tracks from one
end of the country to another, side-by-side UTV
drivers are realizing how much of a performance
advantage the Black Diamond can provide.
WORCS-winning RZR sports STI Black
Diamond tires mounted on STI’s brand-new
HD Beadlock wheels.
A former quad racing
hero, Granlund is now making a name for
himself in side-by-side UTV racing.
First place at a WORCS event will do
that for you.
The Auburn Extreme
Powersports RZR put on quite a show at
the VORRA short course event in Prairie
For example, in the most recent World Off Road
Championship Series (WORCS) event at Speed World
MX in Surprise, Arizona, Nic Granlund took his
STI Black Diamond-equipped Polaris RZR to a
convincing victory in the highly competitive SxS
Production 850 class. This former quad racing
star from Las Vegas topped a field of 18 cars in
a race that lasted just over 41 minutes. For
this race Granlund had his Black Diamonds
mounted on STI’s brand-new HD Alloy Beadlock
wheels—a smashing debut for the groundbreaking
With three top-five finishes in four events,
Granlund now holds fourth place in the class
point standings (and he didn’t even compete in
the opening round).
On the opposite side of the country, John Yokley
is showing how well the Black Diamond works in
the woods. Driving a Polaris RZR XP 900 for Big
Country Powersports, Yokley is enjoying
considerable success in Grand National Cross
Country (GNCC) racing. He and co-driver Jarrod
McClure got their feet wet in UTV racing in this
series—which takes place at selected GNCC
events—during the first round in Washington,
Georgia. They placed seventh overall out of 46
entries, also good for seventh in the XC1
Modified class. That result was nearly
duplicated at the next round in Union, South
Carolina, where Big Country placed eighth
overall and again seventh in class in an
extremely dry and dusty, hour-long race. Thanks
to this consistent performance and tire
reliability, the team currently stands a
promising sixth place in season points.
Shooting back to the western end of the nation,
the UTV racing effort of Auburn Extreme
Powersports continues to impress with its own
impeccable RZR XP 900. As you may recall, this
team made a splash at the recent King of the
Hammers event. The car was then entered in a
Valley Off Road Racing Association (VORRA) short
course event at Prairie City in northern
California, where it had a highly competitive
battle in progress until breaking a CV joint
late in the race. For an entertaining in-car
video of this adventure, visit
It’s activities like these—putting a product
through the wringer like only racing can—that
provides tremendous feedback to STI engineers to
help make future tires and wheels even better.
We’d say our current level of development is
already in the winner’s circle.
STI tires and wheels are available at finer
ATV/UTV dealers everywhere, through MTA
Distributing. For more information, to place an
order or to locate an STI dealer, visit
www.stitireandwheel.com or call: East (318)
255-0049; West (951) 272-0971.