The Legendary History of NAGASAWA Racing Cycles: From Osaka to World Championships

In a decisive turning point, Nakano began riding a Nagasawa frame Keirin bike in April 1977, subsequently dominating the sport with an unprecedented ten consecutive world titles—all aboard Nagasawa’s meticulously crafted frames. Consequently, these achievements cemented Nagasawa’s reputation in the track cycling community, establishing his bicycles as the gold standard for professional Japanese track racing machines.

Nagasawa Perfecting His Craft

Throughout the decades, Nagasawa continued to perfect his craft, hand building each Keirin bike with unparalleled attention to detail and technical excellence. Moreover, he remained actively involved in the racing scene, frequently attending competitions as a respected mechanic to ensure optimal performance of his creations.

Nevertheless, all good things eventually come to an end; Mr. Nagasawa has since retired, meaning custom frames from this legendary builder are no longer available. As a result, existing Nagasawa Keirin bikes have become highly coveted collector’s items, representing a significant chapter in the history of track cycling and Japanese craftsmanship. Furthermore, their legacy continues to influence contemporary track bike design worldwide.

NAGASAWA Special Keirin Bike Frame: Handcrafted NJS-Certified Excellence

The NAGASAWA Special Keirin bike frame stands as a testament to Japanese precision engineering and artisanal craftsmanship. Each frame bears the coveted NJS (Nihon Jitensha Shinkokai) certification stamp, indicating it meets the stringent quality standards required for official Keirin racing in Japan. Furthermore, these frames are characterized by their meticulous construction, typically featuring traditional track geometry optimized for velodrome performance.

The frames are hand-built using premium steel tubing, which provides the perfect balance of responsiveness, durability, and the distinctive ride quality that professional racers demand. Additionally, the exceptional attention to detail is evident in every aspect, from the immaculate welding to the signature paint finish that distinguishes a NAGASAWA from other track bikes.

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High Standards For The Nagasawa Special

What truly sets the NAGASAWA Special Keirin bike frame apart, however, is the builder’s intimate understanding of racing dynamics. Consequently, each frame embodies decades of track racing wisdom, with subtle refinements that give riders a competitive edge. The frames feature precise angles and measurements calibrated specifically for the demands of Keirin racing, which requires both explosive acceleration and stable handling at high speeds.

These frames have become legendary among collectors and enthusiasts. Their limited supply—especially since Mr. Nagasawa retired—has raised their status. NAGASAWA frames are still raced in competitions today. This shows their timeless quality and excellent engineering. Each frame is a functional work of art. They are more than just historical artifacts.

Premium NJS-Stamped Components: Exploring the Sugino, Hatta, and Dura-Ace Build

The NAGASAWA Special Keirin bike boasts many NJS-stamped components. Every part meets Japan’s strict racing standards. The drivetrain centers around the famous Sugino 75 NJS crankset (165mm length). This pairs with a 48-tooth Sugino 75 chainring. This combination is known for excellent power transfer. It also offers great durability during high-torque sprints.

This connects to an 18-tooth Soma Fabrications Track Kog and Izumi Jet Black Eco chain, delivering reliable power transmission essential for Keirin racing. 

Furthermore, the bottom bracket features the precision-engineered Hatta RS400 NJS square taper model, complemented by the Hatta Swan Super Deluxe NJS headset, both representing Japanese component craftsmanship at its finest. Additionally, the cockpit utilizes a Nitto Dynamic 10 stem (100mm, 26.0mm clamp) and Soma Fabrications HWY One handlebars with 130mm drop and 75mm reach for optimal control.

This Nagasawa Special Utilizes Top Notch Rims And Tires

The wheelset construction is equally meticulous, built around Dura-Ace 7710 hubs—32-hole front and 36-hole NJS-certified rear—expertly laced to Mavic Open Pro rims. Consequently, this creates a wheel system balancing lightweight performance with the structural integrity needed for track racing’s intense accelerations and high speeds. The wheels are wrapped in matching Vittoria Rubino Pro 23c tires, offering the essential grip-to-weight ratio demanded by professional Keirin racers.

Framesets Highly Valued By Professional Track Racers

Moreover, the control points include MKS Sylvan Road pedals paired with MKS Slips featuring leather-wrapped clips, providing the secure foot retention critical for powerful starts. The rider contact points are completed with a Fizik Arione saddle mounted on a Salsa Shaft 27.2mm seatpost. Therefore, each component not only meets the strict NJS certification requirements but also contributes to the overall craftmanship. This is what makes a Keirin bike like this NAGASAWA Special a precision racing instrument trusted by champions.

NAGASAWA Special Keirin Bike Performance: Why Track Racers Still Covet These Rare Machines

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Framesets Precise Alignments

Furthermore, the precise alignment of the rear triangle ensures that power delivery remains efficient throughout the entire pedal stroke. This is particularly true during the explosive acceleration phases characteristic of Keirin racing. The frame’s weight distribution and precision-calculated center of gravity contribute to its famous race performance. These features allow riders to maintain control even when pushing their physical limits.

Framesets Highly Valued By Professional Track Racers