12A Light Weight Flywheel

Green Brothers brand new 12lb flywheel with new genuine Mazda ring gear. CNC machined right here in the BOP from 4140 chromoly steel. Suits all 12A and 13B engines (300mm ring gear)

• Milled recesses for pressure plate rivet clearance 
• 2x stepped bolt holes for correct pressure plate alignment
• Ring gear can be replaced, should the need arise 
• Proven to 12,000+rpm 

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