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Strengthened Clutch Pivot Ball: A 50% Improvement


Considering that the Clutch Pivot Ball is known to wear quickly and break on many Subaru models, as well as the Toyota 86, a strengthened CPB is an important upgrade for the longevity of the drivetrain.

We spoke with our engineers and came up with a metal composition we were happy with. This composition would improve the strength of the CPB, allowing it to withstand more stressors and potentially last longer for the driver. We were also able to keep the installation the same as a direct replacement product.

We improved the strength of the CPB by changing the material from mild steel to CR40 chromoly steel. This change resulted in a 50% increase in strength (estimated using an HB equivalent, as we can’t perform Rockwell tests on mild steel). It allowed us to make the metal stronger without making it brittle, which is a common issue when increasing hardness.

A stronger CPB is perfect for high-performance applications such as:

  • When increasing your engine power
  • Having a heavy clutch load from frequent hard launches

For the price point, even street cars can benefit from a strengthened CPB due to their increased durability and wear resistance. This means you might not need to change it as often as the OEM’s mild steel component.

The particular composition will help to maintain consistent clutch operation and engagement point over time and decreases the chance of permanent deformation under pressure.

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