D.I.D Racing Pro NJS Chain

D.I.D Racing Pro is a classic Japanese track chain for track, keirin, and fixed gear. It’s a 1/2 x 1/8-inch chain for drivetrains with a wide track chainring and rear cog, built for high loads and for cyclists who want a strong, smooth-running chain with a clear connection to Japanese track culture.

Racing Pro is NJS-certified and approved for professional keirin in Japan. The NJS marking means the chain meets the requirements for components used in Japanese keirin and is an important part of the product’s identity - this is a genuine track chain, not an ordinary single speed chain with a racing name.

D.I.D chains are especially valued for their smooth, quiet running, making Racing Pro a great choice both on the velodrome and for a well-built fixed gear bike for the street. The silver finish is corrosion-resistant and keeps the look classic and understated.

Racing Pro is the right choice if you’re building a serious fixed gear or track bike with a 1/8-inch drivetrain and want a Japanese NJS-certified chain where strength, precision, and smooth running are front and center.

Quick Specs

• Product type: Track / fixed gear chain
• Chain size: 1/2 x 1/8"
• Use: Track, keirin, fixed gear, and single speed with a 1/8" drivetrain
• Fits: Chainrings and rear cogs designed for 1/8" chains
• Does not fit: Geared drivetrains and components designed for narrower derailleur chains
• Certification: NJS-approved for Japanese keirin
• Finish: Silver, corrosion-resistant
• Manufacturer: D.I.D / Daido Kogyo, Japan