Chain Wear
Fretting is a common wear mechanism in chains of all types, from bicycles to heavy machinery. It becomes a major source of wear when lubrication is inadequate or operating conditions are harsh. Fretting occurs when metal surfaces under load experience microscopic back-and-forth motion.
In bicycle chains, fretting primarily occurs in two areas:
How Damage Builds
Over time, fretting weakens the chain by progressively removing material, creating micro-cracks, increasing elongation, and adding friction. The chain no longer fits the sprockets properly, efficiency drops, and premature drivetrain failure becomes inevitable.
How to Fight It
Apply lubricant thoroughly and consistently, ensuring penetration into the pin–bushing interface where wear originates.
Use a water-resistant, corrosion-resistant lubricant when riding in wet, muddy, or humid conditions to maintain a protective film and prevent corrosion-driven wear.
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