The S1 is KMC's entry-level single-speed chain, built for reliability on single-speed, fixed-gear and internal-gear-hub bikes.

  • Standard-plate construction for everyday strength and durability
  • 112 links, 1/2" x 1/8" width
  • Suits single-speed, fixed-gear and internal-gear-hub (IGH) bikes
  • A quieter, reinforced-tension build aimed at reducing chain noise and chain drop

Not a lightweight performance chain — the S1 is built as a durable, no-fuss replacement for riders who just need a reliable single-speed chain.

Fits 1/8" single-speed drivetrains, including fixie, BMX and IGH bikes. Not for use on derailleur (multi-speed) drivetrains, which need a narrower 3/32" or 11/128" chain.

KMC chains are covered against manufacturing defects. If a chain fails from a defect in materials or workmanship, return it to Tune Cycles with your proof of purchase and we'll manage the claim with KMC on your behalf — no need to contact the distributor yourself. This is in addition to your rights under Australian Consumer Law, which apply regardless of any manufacturer's warranty.

  • Standard-plate construction
  • 112 links
  • 1/2" x 1/8" width
  • For single-speed, fixie and IGH bikes
SpeedSingle speed
Links112
Width1/2" x 1/8" (wide)
UseSingle-speed, fixed-gear, internal-gear-hub bikes
SKU BPW-KMC-S1
Brand KMC