Lightened & balanced race clutch/flywheel! The OS Giken TR1A Clutch & Flywheel is a stronger and lighter upgrade for your stock set-up. If you're running higher HP or tracking your Lotus, this solution is for you. This setup was designed specifically for track-driven, high-performance cars to deliver a much better throttle response and increased durability. A key advantage is that each kit is balanced to insure smooth operation..

Stronger Than Stock = Handle More Power Safely

• Dual diaphragm spring
  • Increased clamping force.
  • Clutch pressure only slightly stiffer than stock.
• Capable of handling up to 464 lb-ft of static load.
• Billet steel housing.
  • Reduces flexing that causes clutch failure.
  • Heat treated for added durability.
• Billet steel hubs.
  • Heat treated for added durability.
• Stronger metallic clutch plate.
  • Higher coefficient of friction than organic OE clutch plate.
  • Heat treated pressure plate.
• Machined aluminum cover.

Smaller Diameter = Better Throttle Response

• Disc diameter is 184mm vs 215mm for the STR clutch/flywheel
  • Reduced rotational mass.
  • Quicker throttle response.
  • Less power lost through the drivetrain.

Balanced With Lightweight Flywheel = Better Performance

• Clutch & flywheel are balanced together.
  • Eliminates any unwanted vibrations.
• Single-piece, heat-treated steel flywheel.
  • Flywheel is 3 lbs. lighter than stock.
  • Heat treated for added durability.

Race Feel & Performance

• Dual-diaphram sprung hub.  
  • 1.8X thicker spring than STR clutch.
  • 1.8X heavier pedal pressure than STR clutch. 
• Slightly more abrupt engagement than stock.
  • Relatively mild friction material makes engagement not as abrupt vs other race clutches.
• Larger throw-out bearing.
  • Larger surface area pushing against clutch spring.
  • Lightens pedal feel.
  • View OS Giken Throw-out Bearing vs. stock.

Free-Floating Pressure Plate

• Sounds like a Ducati when the clutch is disengaged
• click HERE to learn more!

Easy 200 mile Break-In Period

• Make sure to properly break in clutch for 200 street miles to ensure the life of the clutch.
• No shifts over 3,000 rpm.

Kit Includes:

• Clutch
• Flywheel
• Throw-out bearing

Model Compatibility

• All Toyota powered Lotus
• C64 Toyota 6spd Transmission

Spyder Lite Save 7 lbs over stock with this clutch & flywheel.