12A Light Weight Flywheel

Green Brothers brand new 10lb flywheel with new genuine Mazda ring gear 

• CNC machined right here in the BOP from 4140 chromoly steel 
• Milled recesses for pressure plate alignment 
• Ring gear can be replaced should the need arise 
• Proven to 12.000+ rpm 

Suits all 12A and early 13B engines (300mm ring gear)

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 others