This is the COMPAK 4 Pro B10 Aluminum Clutch for 1/8 Off-Road Cars, the 4-shoe adjustable clutch that redefines the concept of tunable clutches by introducing a unique adjustment system to the market. This system allows you to change the clutch stiffness with the engine mounted and the car fully ready to run.

The COMPAK concept, just like its predecessor, refers to clutches that are installed on the engine fully assembled.

Adjust in Seconds

Simply flip the car, lock the flywheel, and move the regulator to the desired position. You can choose between three levels of stiffness (I, II, III), laser-engraved directly on the flywheel. This innovation minimizes clutch adjustment time. “I” is the softest setting or mounting position, and “III” is the hardest. To check the current setting, just see which number aligns with the adjustment hole on the regulator.

Universal System – Compatible with Most Cars

The 33 mm flywheel has been carefully designed to ensure compatibility with most brands on the market. In addition, the set is precisely designed to fit ULTIMATE clutch bells. Other clutch bells on the market may not be compatible with this clutch.

Intuitive and Simple Assembly

Thanks to its innovative design, assembling the COMPAK is as easy as pressing the springs with your fingers into the assembly position. A quick solution for drivers seeking simplicity without sacrificing performance.

Guaranteed Longevity

The springs can be relaxed by setting them to position “I” after each training session or race, preventing deformation over time. This often-overlooked detail extends the lifespan of components and ensures consistent performance race after race.

Aluminum Shoes with Wear Indicator

The four aluminum shoes include a linear recess that acts as a visual wear indicator. When wear erases this mark, it’s time to replace them—ensuring you never compromise traction or reliability. It is recommended to replace the springs along with the shoes to maintain optimal balance.

COMPAK Clutch Contents:

• 4 aluminum shoes
• 4 springs
• 1 black anodized aluminum flywheel with laser engraving
• 1 clutch nut
• 1 high-precision spring regulator
• 1 red anodized aluminum front cover

For clutch bells use UR0661 or UR0662