I have had the Vredestein Wintrac Extreme in the default tyres during the last 2 snowy swedish winters. I can say that although is by definition not the best snow mobile, i can say that it is more than driveable even on snowy conditions, providing that your brain is still inside your head of course! The Vredesteins made a very good job even in the dry/wet winter conditions, although at the expense of less than expected tread life...especially in the rear ones