High-Performance Engineering, Born in Japan. Perfected in Europe.

From racetrack dominance to street-ready precision, we deliver unmatched drivetrain and engine components built on decades of innovation by OS Giken Japan.

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About Us

We are proudly the NR1 specialist of OSGIKEN Europe.

Starting in the early 1960s, Osamu Okazaki embarked on a mission to craft high-performance Japanese race engines to rival the championship-winning European cars of the era. Over time, his team expanded their expertise, specializing not only in engine development but also in advanced drivetrain components, including high-precision couplings and limited-slip differentials, to enhance vehicle performance and handling on the track.

Power

With the amount of power the OS built motors were generating, they had to design their own clutches

Technology

As time passed and technology progressed, the need for a better limited-slip differential presented itself

100%

OS Giken parts manufactured

Trusted world-class brands and organizations of all sizes.

Dealers

Country	Name	Address	Website	Phone number
Belgium	Portello Motorsports	Toevluchtweg 4c 8620 Nieuwpoort	portello.be	+3258234940
Germany	SPS Motorsport GmbH	Im Petersfeld 4, D - 65624 Altendiez	sps-motorsportshop.com	+4964326409960
Italy	Performance Equipment	Vaile Rimini 1, 47838 Riccione		+393392008104
Netherlands	Hardeman Motorsport	Zandweg 20A 4416NB Kruiningen	Hardemanmotorsport.nl	+31113700266
Poland	Tomson Motorsport	Falencka 28, 05-090 Raszyn	tomson.com.pl	+48228365040

Superior Overall Performance

The OS LSD standard spec allows for low preload while still retaining a fully progressive 100% lock capability

Super Design

Miniaturized pressure ring and a superior spline-through-side-gear design allows for fitment of more friction plates (up to 2x as many as competitors versions), offering true 100% lock capability. Patented pressure ring design allows for smooth, progressive locking. The case has a relief cut-out for the cone spring, for minimized cone-spring flexing and enhanced durability.

Superior Construction

All components are chemically heat treated for maximum durability. All components are constructed with high-grade steel alloy. The gears are raw-forged for maximum strength. The disks are precision-machined simultaneously on both sides to extremely tight tolerances. And case is billet construction.

Products

Performance Clutch

Through our research and development of high performance engines, we realized the need for the production of higher quality and more durable clutch systems to meet the rigorous demands of racing

Limited Slip Differential

The OS Super Lock LSD is the culmination of over four years of extensive research and development that led to a revolutionary LSD design with the capacity to house an unprecedented number of friction plates

Close Ratio Gear Kit

OS Giken Close Ratio Gear Kits are developed for those seeking improved drive train reliability and faster lap times. Gear ratios are carefully calculated for each vehicle application for the sole intention to maximize your engine’s potential

Special Parts

Our extensive racing experience matched with our technical manufacturing knowledge, has led to the development of a wide assortment of custom and limited parts to meet the rigorous demands of the ambitious racing world

How it works

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