13B Rx7-Rx8 Light Weight Flywheel

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

• 3x pressure plate alignment hardened dowels 
• Ring gear can be replaced, should the need arise 
• Proven to 12,000+rpm
• Suits all 13B turbo engines and any rotary (12A, 13B, 20B) running a 13B turbo gearbox (320mm ring gear)
• Also suits Rx8 applications 

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