absoluteBLACK Narrow Wide Oval CX 110 4B Chainring Black

. Size (Mass +/-1g): 38T (61g), 40T (65.5g), 42T (71g) Bolts included to every chainring (mass given for chainring only) . Colour: Black, Ultegra Grey . Compatibility: Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2, Ultegra 8000, R8020, R8050 & 8070 Di2., 105 R7000, R7020, R7070, Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700 ; 10 / 11 / 12spd compatible . Material: cnc machined 7075 Txxx Aluminum. Long-lasting construction . Finish: type II anodizing . Ovality: 10.5-11.4% ; Timing of 112-113 after TDC (top dead centre) - Patent Pending ADVANTAGES OF OUR SPECIAL CX OVAL CHAINRINGS: . Finest design to provide excellent weight to strength ratio . One of a kind special oval shape (Patent Pending) . Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months . Special 3D teeth machining for ultimate mud relief decrease wear and noise dramatically . Designed to handle mud and grass with easy . Superb quality and great look. . You will ride faster using ovals. If you keep using round ring then others will get quicker . Reduces stress on knees and helps to maintain your legs fresher for longer . You will not "feel" the oval shape at all