X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain controlX-Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gearImproved aerodynamics for time trial and triathlonLaser-etched chainring finish is more durable Direct Mount38TBlack/Silver12spNarrow/WideUPC/EAN/GTIN: 710845911743