13B Light Weight Flywheel 7.25in

Green Brothers brand new 12lb flywheel with new genuine Mazda ring gear is CNC machined right here in the BOP from 4140 chromoly steel 

• Ring gear can be replaced, should the need arise
• Proven to 12,000+rpm 
• Suits all 13B turbo engines and nay rotary (12A, 13B, 20B) running a 13B gearbox (320mm ring gear)
• Suits all 7.25in single and multi plate clutches 

4140 vs 1045 Material 

4140 is significantly stronger and has a superior wear rate compared to the more commonly used 1045 material. Subsequently 4140 has a higher purchase price, hence the reason Green Brothers flywheels cost a little more than some others