Light, stiff, and durable direct mount chainrings let you pick the exact gearing you want and quickly swap sizesX-Range gearing technology gives you more range and a smoother gear progression, so youâre always in the right gearX-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain controlImproved aerodynamics for time trial and triathlonLaser-etched chainring finish is more durable Direct Mount40TBlackNarrow/Wide0mmUPC/EAN/GTIN: 710845916656