SAMD, the problems with reducing the diameter of the flywheel are many and thought the best option is impractical to most.
Flywheel's hitting the ground for obvious reasons is a problem but in some cars, later ones especially, it cannot happen. However the forces exerted into the flywheel by the sump or adaptor plate hitting the ground will exert some similar forces.
The reduction in weight of the flywheel is to help the transitional forces from the flywheel into the crank and by a reduction in weight of the standard flywheel its a relatively simple thing to have done. The change has already been made around the globe except here as normal
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