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Premium Pre‑Waxed Drivetrain Efficiency – Factory‑waxed using KMC GO Chain Wax for low friction, longer wear life and reduced dirt build‑up compared to oil‑lubricated chains Lightweight “L” Construction with Hollow Pins – X12L version features lightweight hollow pins for optimized weight while maintaining high rigidity and strength Double X‑Bridge for Fast, Precise Shifting – Precisely chamfered plates and X‑Bridge shaping deliver smooth, responsive shifting across 12‑speed gear ranges Wide 12‑Speed Compatibility – Fully compatible with Shimano, Campagnolo and TRP 12‑speed systems; not compatible with flattop chains Supplied with KMC MissingLink – Comes with a reusable MissingLink for easy chain installation and removal