External Chamfering Technology - The 12-speed chain uses external chamfering to prevent contact between chainring teeth and the chain, promoting smooth operation and reducing potential interference. Easy to Install - 126-link chain is designed for quick installation and straightforward operation. - Can be installed quickly without tools; convenient to use. - Installation pliers can be used to assist with joining. Carbon Steel Material - Made from high-quality carbon steel for durability. - Wear-resistant and strong, providing long service life. High-Strength Shaft - Features a high-strength shaft to withstand greater pedaling force. - Fine workmanship delivers stable performance for reliable cycling. Specifications - Length: about 160 cm (63.0 in) - Weight: about 313 g (11.0 oz) - Links: 126 - The extra links provide reserves for future upgrades to the drivetrain. Use scenarios - Replacing a worn chain on a 12-speed road bike to restore smooth shifting and pedaling efficiency. - Upgrading a 12-speed drivetrain on a mountain or gravel bike for improved performance and reliability. - Keeping a spare chain on long rides or trips to ensure quick maintenance and reduced downtime.