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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 always make sure we have great 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.
Kevin in New York
I have owned 3 sets of STI Mud Trax XL tires for various machines in the past and was impressed with them except for the rough ride on hard pack or roads. When I found the OUTBACK XL I just had to try them out. Prices are beyond competitive on this tire and the tread pattern looks super cool. I bought a set of 26" XL's for my wife's 2007 Grizzly 700 and after one ride I ordered a set of 27" xl's for my 2012 Grizz 700. The tread is aggressive enough to power you through mud up to the floor boards but the pattern is just close enough together that they ride smooth on the road. They run true to size or a touch tall in my opinion but are definitely round in the middle, even with 3 lbs air the center of the tire is doing most of the work on hard pack. The Tread is deep, much deeper than photos, you will have to be careful driving across your lawn as they will tear stuff up.Read All Reviews
aaron in MS
Great tire, this ply rating helps immensely with the thorns and sharp rocks out west! Have not cut a sidewall yet, but the thorns are impossible to avoid. Only has small leak which is easily repaired with some tire slime! I have since purchased them for my YFZ450.Read All Reviews
MICHAEL in NH
I had read some reviews and talked with salesperson on these tires and was told they should fit the bill. We run in northern NH and deal with a lot of loose rock and sharp rocks. I tend to stay away from big mud. So far these tires have performed perfect for us. My wife loves how the machine climbs now. With stock tires would spin and slip around some and with these the machine just trudges up and over without any fanfare. Work ok in mud but work perfect on rocky sections. Love these tires.Read All Reviews
Phillip in VA
The tire is very narrow, coming in at 6.75" mounted, the rim guard doesnt touch the rims there is an 1/8" gap between the edge of the tire and my rim all the way around and on both sides. The tire rides smooth and absorbs shock well but it just to narrow for a 7" rim, 5-6" rim width would be okay, but not 7" like mine. This is mounted as the front tire of a customized atc250es, Using a douglas .190 12x7 4/110 5+2Read All Reviews
Joel in Manitoba
I bought these a while ago after one year of recreational mx track riding. NOT racing. They started cracking around the tread lugs. After not riding for a year I spend money to go ride at a track and now my rear is leaking through a big crack in the lug I could probably rip the lug off by hand. All I ride is track and in sand no rocks or any spinning on anything that would wreck a tire like this. Front tires seem good. For sand and soft dirt I find they dig a lot and bite really hard. They have a lot of traction both front and rear but I'm not even half way worn between the wear indicator and where they were brand new and now I have to replace my rear tiresRead All Reviews