The xtr 96bcd narrow wide oval single chainring is designed to provide a more constant torque to the rear wheel thereby reducing spinouts and stalls on tough climbs the 12 percent ovality equals a 30 34t range for the 32t model and the 115 percent clocking from the crank puts the major axis in your power stroke the narrow wide tooth profile eliminates chain drop with the perfect chain mesh fit and the perfect 49mm chainline corrects from the stock 504mm this gives a quieter drivetrain with i