The KMC S1 is a wide 1/2″ x 1/8″ single speed chain for bikes without derailleurs, such as BMX, cruisers, kids bikes and fixies with 1/8″ sprockets. It comes with 112 links in Brown, Silver or Red.

A rusty, stretched or noisy chain is one of the most common problems on single speed and kids bikes, and it is a quick, cheap fix. The S1 is an easy way to get a bike back in action, or to add a splash of colour with the Red version.

Made for single speed bikes

The wide 1/8″ chain suits non-derailleur bikes such as BMX, cruisers, beach bikes, kids bikes and track-style bikes.

Quiet running

KMC designs the S1 for low noise, so the chain runs smoothly without the clatter of a worn chain.

Anti-drop design

The plate design helps keep the chain on the sprockets for a more secure feel.

Choice of colours

Choose Brown or Silver for a classic look, or Red to brighten up a cruiser, BMX or custom build.

Frequently Asked Questions

Will it fit my bike?
It fits single speed bikes with 1/8″ sprockets. Bikes with 3/32″ sprockets or derailleur gears need a narrower chain.

How many links does it have?
112 links. Shorten it with a chain tool to suit your bike.

What is the pin length?
9.3mm.

Item specs

• Brand: KMC
• Model: S1
• Speed: Single speed (non-derailleur)
• Size: 1/2″ x 1/8″
• Length: 112 links
• Pin length: 9.3mm
• Low noise, anti-drop design
• Suits: BMX, cruisers, kids bikes and other single speed bikes
• Colours: Brown, Silver, Red