1.875 x 121 track ( it's 1 7/8" inch but I call it 2")off a 05 Polaris IQR racer. Fits any polaris, ski doo, arctic cat, or yamaha with 15 inch rails, 2.52 drivers and enough tunnel clearance. Has screw-in ice picks on top of each lug for ice traction and to stiffen lugs even more. Good shape, only half of one lug missing. Eric
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