CAMPAGNOLO RD20 RECORD 12s 34tInnovatiive shape created with 3D Embrace technology increases shifting precision, speed, power and ensures the optimum distance from the sprocket at all times New longer cage model to support the use of 11 34t cassettes The upper portion of the gearbox is made of carbon fiber reinforced technopolymer for low weight and high durability Consistent accuracy through small bump and vibration absorbtion