Overview Reviews Product Description Driven 1037-520-15T Lightweight Steel Front Sprocket fits Yamaha YZF-R1 15T Driven 1037-520-15T Product Videos Custom Field Product Reviews Write a Review Write a Review × Driven Driven 1037-520-15T Lightweight Steel Front Sprocket fits Yamaha YZF-R1 15T Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *