I went with 1.6 Cobra on my X with 96 studs, gotta double check the length. I thin it's about a 0.10" clearance.
Works mint; will spin slightly when u punch it on glare ice but will quickly gain traction and away she goes. Braking is absolutely sufficient on same said ice.
As for trails, it provides me a great combination bite and leeway. Meaning it hauls like a rocket every down every straight and out of every corner, even in the shitty rock hard conditions I rode in. Yet in the corners where it was not only hard packed and bumpy, but also icy on spots, and I was able to come into corners hot, ride the break a bit and keep on the gas, allowing the rear end to slightly break the corner, much like a controlled drifr or slide. Never felt out of control, nor did i feel like i was "actually" sliding. This really allowed me to shred thru the twisties. In the steep, hard-90 turns that come fast corner after corner, I could still lock the brakes up and get the back end to come right out and around the corner, and although the backend would feel completely free at this point, the moment my skis cleared the apex of the corner, I could punch it hard and the track would grab and launch me out of the corner in said direction. So essentially, the track/stud combo was allowing the track to still break free when "locking" the brakes up, yet provide enough penetration to confidently launch out of the corner after sliding the rear end around the apex, instead of blowing the corner and sliding straight into the woods. (Again, same hard packed conditions as mentioned above )
This combo also works very well off trail and absolutely dominates the trail when there's fresh loose snow.
That said I haven't tried it with a backcountry x, so I can't honestly compare, and I imagine that backcountry hooks like a menace when shit gets loose.
But with my setup I go anywhere my buddy on his assault goes and then some and we were in heavy, wet conditions 4-5 feet deep with a layer of ice glaze over the top, about an inch or two thick.
It's basically quicksand covered in eggshels, and the Cobra did very well considering.
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