KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors
KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors

KMC S1 Single-Speed Chain – 1/2" x 1/8" – 112 Links – Multiple Colors

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The KMC S1 is a single-speed chain designed for BMX, fixie, and internally geared bikes that use a 1/8" drivetrain. It’s a durable, everyday chain commonly chosen for simplicity and reliability rather than weight savings.

This model replaced the older KMC Z410 and fills the same role as a straightforward, serviceable single-speed chain.

Key Features
• Single-speed specific chain construction
• Anti-drop plate design to reduce chain derailment
• Durable steel construction
• Direct replacement for the former KMC Z410
• 112-link length

Compatibility & Use Notes
• Single-speed use only
• Chain size: 1/2" x 1/8"
• Compatible with BMX, fixie, and internally geared hubs
• Not compatible with multi-speed drivetrains
• Available in multiple color finishes
• Chain width: 8.6mm

Service / Ownership Context
Single-speed chains rely heavily on correct chainline and tension. Proper sizing during installation and regular lubrication will extend chain life and reduce drivetrain noise.

Fit & Use Signals
• Good fit for BMX, fixie, and internal-gear bikes
• Good fit if your drivetrain uses a 1/8" chain
• Good fit for everyday riding and commuting
• Not a fit for multi-speed drivetrains
• Not a fit for 3/32" chain systems

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