RPC LIGHTWEIGHT FLYWHEEL TO SUIT HONDA K20 K24 ENGINESWeighing only a mere 3. 2KG, RPC Lightweight Chromoly Flywheels are made from 4140 one piece billet chromoly steel. They are specifically designed to reduce weight and inertia for better engine response. Most incorporate special design features to enhance the air flow to improve the cooling of the clutch. The ring gear teeth are milled onto the flywheel unlike an aluminium flywheel where the ring gear is pressed onto the flywheel which has the