NOTE: This is a special order product from Bonamici Racing with a 30-45 day lead time.

Developed specifically for high-level racing applications, the Bonamici Racing Chain Adjuster is engineered for Yamaha YZF-R9 motorcycles fitted with the Yamaha Tracer 9 / XSR900 swingarm conversion (OEM swingarm code B5U221100000). Designed with track performance in mind, this premium system delivers precision adjustment, rapid servicing capability, and race-proven durability.

Created to suit the geometry of the longer Tracer 9 / XSR900 swingarm setup, this racing-focused solution has been designed to meet the demands of professional teams and dedicated track riders seeking improved chassis performance and faster pit lane operation.

The system incorporates a specialised quick-release axle arrangement that simplifies rear wheel removal and installation during race conditions. Precision CNC machining and premium materials ensure excellent strength, reliability, and consistent performance under extreme use.

• Purpose-built for Yamaha YZF-R9 race and track motorcycles
• Designed for use with Yamaha Tracer 9 / XSR900 swingarm conversion
• Compatible with OEM swingarm code B5U221100000
• Developed exclusively for racing and closed-course use
• Quick-removal rear axle system for efficient wheel servicing
• Axle manufactured from solid CNC-machined 39NiCrMo3 steel
• Internal lapping process improves machining precision and fitment accuracy
• Protective phosphated surface treatment for enhanced durability
• M24x1.5 thread configuration
• Recessed hex-drive axle head allows rapid tightening and removal
• Left-hand side designed for direct axle insertion
• Right-hand adjuster integrates threaded axle fastening without requiring a separate nut
• Integrated support bracket for OEM Yamaha YZF-R9 rear brake caliper
• Compatible only with genuine Yamaha YZF-R9 rear brake calipers

Fitment Information: This product has been developed specifically for Yamaha YZF-R9 motorcycles using the Yamaha Tracer 9 / XSR900 swingarm conversion. It is not compatible with Yamaha MT-09 swingarm configurations.

Bike Fitment:

Yamaha YZF R9 2025-