Nagasawa Special NJS

The Nagasawa Special NJS represents the pinnacle of Japanese keirin racing craftsmanship. This 55cm steel frame build showcases components that meet the strict standards required for professional velodrome competition. Every part on this bicycle earns its place through precision engineering and proven track performance.

Frame and Fork: The Nagasawa Foundation

The Nagasawa Special NJS frame forms the heart of this track bike build. Japanese frame builder Yoshiaki Nagasawa has crafted competition frames for decades, and this 55cm example demonstrates his meticulous attention to detail. The steel tubing delivers responsive handling while maintaining the stiffness needed for sprint efforts. Furthermore, the geometry follows NJS certification requirements, which ensures the frame meets professional racing standards.

The matching Nagasawa fork pairs with a Hatta Swan Super Deluxe NJS headset. This headset uses sealed cartridge bearings that provide smooth steering input. As a result, riders experience precise control during banking maneuvers and tight pack racing. The fork rake and trail measurements work together to create predictable handling characteristics at high speeds.

Drivetrain Components: Power Transfer Excellence

The crankset consists of Sugino 75 arms mounted to a Hatta R9400 NJS bottom bracket. Sugino has manufactured track cranks since the early days of keirin racing, and the 75 series remains their flagship model. The forged aluminum construction resists flex under heavy pedaling loads. Meanwhile, the Hatta bottom bracket uses precision bearings that spin freely with minimal drag.

The chain and cog selection follows traditional keirin specifications. An HKK Vertex Blue NJS chain connects to a Dura Ace 16T NJS rear cog. This chain features blue-tinted side plates that indicate the premium heat treatment process. Additionally, the half-link design allows precise chain tension adjustment. The gear ratio created by this setup suits velodrome racing where riders maintain high cadences throughout events.

Cockpit and Contact Points: Rider Interface

Nitto components dominate the cockpit area of this Nagasawa build. The Nitto 123 handlebars provide a traditional track bend that positions hands for optimal leverage during standing efforts. These bars connect to a Nitto Jaguar 100cm NJS stem, which offers reach and drop measurements suited to aggressive racing positions. Consequently, the rider can generate maximum power while maintaining an aerodynamic profile.

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The saddle and seatpost combination uses a Nitto Jaguar SP72 NJS post topped with a FiveGold 7 saddle. This seatpost features a single-bolt clamp design that allows quick saddle angle adjustments. The minimal padding on the FiveGold saddle reduces weight while providing adequate support for short track events. Pedal contact comes through MKS Custom Nuevo NJS pedals paired with Toshi straps. These pedals accept traditional toe clips and leather straps that secure feet during the pulling phase of each pedal stroke.

Wheelset: Rolling Performance

The wheelset on this Nagasawa Special NJS uses Araya Gold rims laced to Dura Ace NJS hubs. Araya manufactures these rims specifically for track racing applications. The gold anodized finish resists corrosion while adding visual distinction. Both front and rear wheels spin on Dura Ace hubs known for their bearing quality and flange geometry.

Soyo Spurt Racing 290 tires wrap around both rims. These tubular tires bond directly to the rim surface using adhesive or tape. The 290-gram weight classification indicates a competition-focused construction. Therefore, riders benefit from low rotational mass that accelerates quickly out of corners. The tire compound grips wooden and concrete velodrome surfaces equally well.

This complete Nagasawa build demonstrates how NJS-certified components work together as a cohesive system. Each part meets strict manufacturing tolerances that ensure compatibility and performance. Track cyclists seeking authentic keirin equipment will find this specification list serves as a reliable reference for their own builds.

The NJS certification program originated in Japan to regulate equipment used in keirin betting races. Components bearing the NJS stamp undergo testing and inspection before approval. As a result, builders like Nagasawa maintain exacting quality standards across every frame they produce. The fixed gear drivetrain eliminates coasting, which means riders must pedal continuously throughout each race.

This direct connection between rider and machine defines the track cycling experience. Similarly, the absence of brakes on velodrome bikes places full control in the rider’s legs and timing. Maintenance requirements for NJS equipment remain straightforward due to the simple mechanical design. Regular chain lubrication, bearing inspection, and tire pressure checks keep these bicycles race-ready.

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