Interesting concept for converting regular tires to snow tires. Via +Richard Masoner and +Tren C 
Bike Spikes : Snow Tires For Bikes
Innovative product by Dutch designer Cesar Van Rongen, the bike spikes are the equivalent of snow chains but for bicycles. Riding in snowy conditions and ice is not an easy task, with this in mind Cesar created these bike spikes. They are made of six flexible parts that attach together with a metal wire in order to tighten onto the bike wheel. They can be placed and removed very quickly, and when not in need can be folded into a small compact bag

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