The Vorsprung Secus Upgrade Kit is a high-performance external air spring modification designed to transform the behaviour of your Fox A3 fork. By dramatically increasing the negative spring volume and introducing a proprietary mid-stroke support valve, the Secus delivers unmatched small-bump compliance, enhanced mid-stroke support, and improved consistency across a wide range of terrain. The result is a more predictable, planted ride feel — especially on rough descents — without sacrificing efficiency on climbs.

Features:

• Vastly enlarged negative air volume for reduced initial spring force

• Proprietary mid-stroke valve improves support and reduces wallow

• More consistent spring rate across travel range

• Better traction, less arm fatigue, and improved small-bump sensitivity

• Retains compatibility with volume spacers and tokens

• External canister design with easy service access

Compatibility:
Compatible with Fox A3 series forks. For specific fitment confirmation, refer to the Vorsprung Compatibility Checker.

Installation Notes:
Self-installation is only recommended for individuals with the required suspension service knowledge and tooling. See the Vorsprung Installation Guides.