We’ve had success tuning multiple trail chassis with the USI X2 Triple Threat Skis and they are much more durable than it’s predecessor the VX-301.  These chassis include Indy, XC, ZX, Apex, and XP.  Adjustability has always been a unique feature offered by USI and the X2 Triple Threat continues that tradition.

USI X2 Triple Threat Snowmobile Ski

The USI X2 Triple Threat works well on many different chassis.


Snow Eater Fins

When researching these skis you’ll find that the “Snow Eater Fins” are offered in multiple depths. These adjust the aggressiveness of the leading and trailing keel of the ski. They will change the handling in varying conditions.  Your decision on your fins can affect your carbide choice. Keep in mind that USI is easy to contact and will help you with your purchase choices.

USI X2 Triple Threat Ski

The Snow Eater Fin is available in varying depths.

USI X2 Triple Threat Skis

The Snow Eater Fin is available in varying depths.

In the past, USI had offered a “Power Steering Plate” that mounted under the ski saddle. Basically, they were different wedge options that would bow the ski to change the curvature. Through development, they found that using a shorter carbide had the same effect and simplified this tuning.

Ski Saddles

Once you’ve assembled your ski bottom, you’ll find that your carbide attaches your ski bottom to your saddle.

USI X2 Triple Threat Snowmobile Skis

The ski-hoop and ski bottom have evolved and are stronger than the original VX/PX?-301.

When mounting the saddle to the spindle you have 3 position options for your ski bolt. The purpose of this is to allow more or less carbide in front or behind your spindle. Using the rear hole will give you very aggressive handling and easy steering, and using the front hole you will find the turning characteristics slower and heavier. To date, we generally use the middle option.

We have noticed in long-term testing that the outer edges of this wide ski will eventually bow up.  Many plastic skis experience this.  When this happens you’ll find it tough to get your saddle/spindle bolt in and out with the ski bottom installed.  We remove the carbides nuts first which removes the ski bottom, then access the saddle bolts.  By the time this happens it’s time to install some fresh ski bottoms, or heat up them up and flatten them again, or just keep riding.

The Performance

Regardless of chassis, the performance feedback on the X2 is consistent from staff and all Guest Testers:

  • Hold corners/lines very well – no under or oversteer
    • Improves rider confidence
  • No “pushing” in the corners regardless of conditions
  • Very precise and aggressive on hard-packed frozen trail
  • Float very well in powder, including on a 136″ Apex Attack GT
    • Tapered tail works well turning/carving fresh powder without being “twitchy”
  • Great lake running ski, fast on hard packed
  • Finding your tuning preferences (Snow Eaters/carbides) takes a bit of dedication but worth it
    • USI staff is knowledgeable and happy to help
    • One person reported tuning his fins manually
    • Bowing of outer edges do not seem to affect performance
  •  Durable – 10,ooo + miles on ski bottoms
  • Switching from Polaris to Yamaha the skis felt the same with a carbide change

USI X2 Triple Threat Snowmobile Ski

The ski bottom not resembles your modern offshore boat with a “stepped” bottom.

UCI X2 Sk Profile

The Triple threat utilizes 3 profiles for speed, flotation, and cornering.


Skis are often the first upgrade purchase for trail riders.  Riding fresh powder on lakes, portages and off-trail is exhilarating, if you can float on top of it.  The USI X2 Triple Threat has performed well in all conditions, on many chassis, and is a go-to ski choice for a number of our guest testers.  Sorry about the 2 bad photos, we’ll try and get those fixed soon.

To see the X2 and other products USI has been offering since 1988, please click here:  USI

The information on USI’s website is a bit limited compared to how technical the X2 really is honestly, so we also wanted to share this video that Braaap Films shot with USI in 2012.