Description: The product is used to replace the rear axle track of a snowmobile in winter. It can be very convenient to travel in the snow in winter. For mountain quad bikes, it can also be better modified to suit all kinds of mountain terrain. Specification: Rear Axle Length: :600mm Sprocket: 428 37T Brake Disc Diameter: 158mm Rear Axle Track Assemly Length: 720mm Track:450mm290mm115mm The picture is manual measurement, and there may be an error of 2-3cm. Fits (For the reference):? This item fit gasoline motor use? Snowmobile? Beach motorcycle? Mountain motorcycle Package includes: Rear Axle Track Assemly (As Picture).