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 is 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 that 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 singlespeed chain with a racing name.

D.I.D chains are particularly appreciated for their smooth and quiet running, making Racing Pro interesting both on the velodrome and on a carefully built fixed gear for the street. The silver finish is rust-resistant and maintains a classic, understated look.

Racing Pro is the right choice for anyone building a serious fixed gear or track bike with a 1/8-inch drivetrain and looking for an NJS-certified Japanese chain where strength, precision, and smooth running are the focus.

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
• Compatible with: Front chainrings and rear cogs designed for 1/8" chains
• Not compatible with: Geared drivetrains and components designed for narrower derailleur chains
• Certification: NJS-approved for Japanese keirin
• Finish: Silver, rust-resistant
• Manufacturer: D.I.D / Daido Kogyo, Japan