With its high-quality steel alloy and by adjusting each internal and external flap that CN-HG901 chain provides excellent shift quality at high running smoothness. Mud and dirt provides the sophisticated design of the unidirectional chain little contact surface. Thanks to the use of Shimano's new SIL-TEC surface coating, the friction of the chain could be significantly reduced. Compared with simple coatings are in SIL-TEC is a special coating process, which prevents abrasion. Through built-fluoride particles, the coating is also stain resistant, which increases the service life of all drive components in addition.