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APPARATUS FOR INCREASING TRACTIVE ADHESION OF WHEELS, IN PARTICULAR TYRE-BEARINGS ONES, TO AN UNPAVED SURFACE, IN PARTICULAR FOR USE ON WHEELS OF MOUNTAIN BICYCLES WHILE CYCLING OVER SNOW-COVERED SURFACES
APPARATUS FOR INCREASING TRACTIVE ADHESION OF WHEELS, IN PARTICULAR TYRE-BEARINGS ONES, TO AN UNPAVED SURFACE, IN PARTICULAR FOR USE ON WHEELS OF MOUNTAIN BICYCLES WHILE CYCLING OVER SNOW-COVERED SURFACES
