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STI is dedicated to the design, development and manufacturing of high quality ATV and UTV tires. Their engineers are committed to developing tires that meet the highest standards and provide the greatest value to their customers. Rocky Mountain ATV/MC has many kinds of STI ATV tires, made for sand, snow, mud, tracks and trails. You can be sure any tire that Rocky Mountain ATV/MC sells is durable and built to last, but we also strive to provide incredible prices as well.
If you need two STI ATV tires, make sure you check out our ATV Tire and Wheel Builder Package which can save you up to 56%. Simply choose two tires and wheels using our filters search that will find the tires to fit your machine perfectly. Then our trained professionals will mount them for free and get them ready to be shipped along with the free valve stems you receive with your package. In addition, you also receive free ground shipping with any ATV Tire and Wheel Package.
darren in Utah
I LIVE IN SOUTHERN UTAH WHERE THERE IS A MIXED BAG OF COUNTRY. FROM SAND, ROCK, SNOW, AND MUD. THIS TIRE HAS PREFORMED WELL IN ALL. LOOKING TO BUY A SET FOR MY 2009 RHINO 700. ONLY COMPLAINT IS THAT TIRES HAVE SMALL AIR LEAKS, SO I JACKED UP GRIZZLY AND AIR UP ALL TIRES TO MAXXX PRESSURE AND LET SET FOR A WHILE. THIS HELPED A BUNCH. TIRES PERFORM GREAT EVEN AT HIGH SPEED, AND GREAT ON TRAILS. ALL AROUND GREAT TIRE FOR THE PRICE!!!!!!!!!!Read All Reviews
casey in CA
These fit my 900 XP4 LE great with the STI Pro-lite wheels 14X7 wheels on front &14X9 wheels on the rear, with this set up I can get just about anywhere in the sand with an otherwise stock machine. I was able to get to the top of comp hill @ Sand Mountain NV with one passenger and to the superbowl with a full load of adults, and was also able to go straight up all but the steepest stuff at Coos Bay OR around the Horsfall camping area. Some other reviewers claimed to have rubbing issues with the V-Roll paddles but I have yet to have any problems. Rear wheels with paddles mounted weighed in @ 31pounds while the fronts with tires mounted weighed only 28 pounds.Read All Reviews
casey in CA
These fit my 900 XP4 LE great with the STI Pro-lite wheels. 14X7 wheels on front &14X9 wheels on the rear, with this set up I can get just about anywhere in the sand with an otherwise stock machine. I was able to get to the top of comp hill @ Sand Mountain NV with one passenger and to the superbowl with a full load of adults, and was also able to go straight up all but the steepest stuff at Coos Bay OR around the Horsfall area camping area. Some other reviewers claimed to have rubbing issues with the V-Roll paddles but I have yet to have any problems. Rear wheels with paddles mounted weighed in @ 31pounds while the fronts with tires mounted weighed only 28 pounds.Read All Reviews
Ryan in Colorado
I just put the Black Diamond XTR through its ultimate test, it passed with flying colors. I was on a local mountain trail riding in 12-15" of snow with some 2 foot snowdrift's thrown in. The XTR's just clawed and chewed their way to the top of every hill....I was very impressed! Lateral traction on off-camber sections was very good as well. My dad was riding Bighorn 2.0's on a Grizzly 700 and those tires certainly did not outperform the XTR's, they did good, but not better than the XTR's.Read All Reviews
Tyler in South Dakota
Size: 25/10/12 all 4 corners. Experiance: 20 years of riding, ITP Blackwater XT's, ITP Holeshot ATR, High Lifter Outlaw Radials, Maxxis Bighorns, Stock Rincon tires, in recent memory. Type of riding: Aggressive. All enviroments with the exception of desert and beach sand. Most common terrain is hard pack, shell, pine needles, mountain. Miles on the tires: 450 Tire pressure: 3.5lbs at around 760lbs - 900lbs when riding dubble. With that info given, these tires are by far my favorite, they ride a tad harder than the ITP ATR's but grip better. Obviousy the outlaws did better in deep snow and mud, however the extra weight they added was not ideal on any atv i have ridden except a tested Renegade 1000. My passenger commented that the ride was noticeably nicer over all the others. Going from a 8 inch to a 10 inch wide in the front was not even noticeable, if anything it may even steer easier, good news if you do not have power steering. Handling improved dramatically over stock and noticeable over anything else with the exception that the ATR's were easier to manage when throwing the tail around. I mounted them on STI HD 3's, when doing so the total weight of these tires and wheels over stock rincon tire and wheels was 13lb's vs the front, did not weight the backs but i would imagine only a few pounds difference top, which is saying something as the Rincon factory rims are about as light as they come. Depending on how many miles these last...and as a radial i'm exspecting a competative amount. These are easily my favorite smile per $ tire. I would like to compare these to the Interco Radial Reptile but Rocky mountain does not carry them and they are a bit heavier than the STI's. Thoughs 2 reasons were why I chose these instead. Quite a lengthy review however I spent weeks doing research and have now spent a fair amount of miles testing them and thought I would share my experiance, Money tight? Realize a sexy mud tire is over kill for your day to day riding? Or do you just enjoy a faster pace riding? Then you wont be disappointed in these tires. Happy trails!Read All Reviews