this is how i see it , if its groomed all the way down then somthing closer to a big ### sno x track and even biggar studs...if it goes bare on the starting line to 150` or so and its soft down track then its the .75 and 1.175 stud deal. thing is you dont know till ya get there and your not gonna change your set up for every track so run what you want to run when you trail ride it. personally for casual winter feild racing your set up might be the way to go. you have to hope for a fairly hardpacked snow surface....sorry i couldnt help ya more.
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