Compatible with all 12-speed derailleur systems (except SRAM Eagle Transmission T-Type, 12-speed road/gravel) Contains MissingLink Perfect shifting thanks to the double X bridge Item no.: BX12AB126W Size: 1/2 X 11/128 Color: Aurora blue Pin length: 5.2 mm Weight per 110 cells: 268 g Length: 126 links X-Series Your bike deserves it. The KMC X series is designed with the specific characteristics of Shimano, SRAM, and Campagnolo systems in mind, meeting the most demanding requirements. Carefully designed and manufactured, X-Bridge technology, thanks to precisely chamfered plates, enables smooth drivetrains and perfect gear shifting in every riding situation. The X series is trusted by many top athletes in professional cycling. Improve your ride with KMC GO WAX Experience the next level of chain performance with our new, advanced dry wax formula. Designed to significantly reduce friction, improve shifting, and ensure optimal efficiency, KMC GO WAX extends drivetrain life by forming a durable microfilm on the chain that repels water and resists dirt adhesion. For cleaner, faster and longer-lasting performance. DURABILITY: Once applied, the wax dries to form a protective barrier that is more durable than oil-based products. CLEANER RUNNING: Our waxed chains attract less dirt, minimizing common causes of wear and ensuring smoother operation. SIMPLE MAINTENANCE: With minimal dirt buildup, your drivetrain requires less maintenance. Refreshing the wax is simple—just use a dry brush or cloth. No degreasing is required, just a simple touch-up with KMC GO WAX. ENVIRONMENTALLY FRIENDLY: KMC GO WAX is biodegradable and contains no PFAS or harsh solvents, making it a responsible choice for both your bike and the environment. Good for your ride, great for the planet We're pioneering change with our premium chain line and are paving the way for a future where our entire chain range will be free of mineral oil-based lubricants. By producing around 5 million chains per year in the X-series alone, we'll soon save around 20,000 kilograms of mineral oil-based lubricants per year. This change is just the beginning. Consider the enormous amounts of oil traditionally used to maintain chains and its impact on our environment. Our wax-based solution not only improves drivetrain efficiency but also significantly reduces the environmental footprint of our products by preventing harmful chemicals from entering our ecosystems.