This video demonstrates the new interlocking 4D sipe system of the Dunlop SP WinterSport 4D. The 4D sipe system gives the tyres lots of edges for grip in ice and snow, while the yellow ball and cup interlocking system ensure the tyre doesn't move around too much on the tread blocks and ensures a good turn in feel.
More information availabile at http://www.tyrereviews.co.uk
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