AD Boivin manufacturers some interesting conversion kits for dirt bikes. We came across a video for the Explorer kit, which essentially replaces the tires with a ski up front and snowmobile-like tracks in back to make them snow-ready (or the tracks can be installed in back while retaining the front wheel to ride on sand).

AD Boivin says the kits are available for a number of dirt bikes (the site says 250F models and up). AD Boivin also offers snowmobile conversions and suspension kits, offering the Snow Hawk conversion for snowmobiles that replaces front skis with one main ski.

Check out the video below of the Explorer kit below.

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Source: AD Boivin