It would be worth mixing in fibres to help give more reinforcement and stop cracks.
Also if you can get the bulk of the mass around the edge of the wheel it will help with the flywheel effect
@Dogtemple started
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It would be worth mixing in fibres to help give more reinforcement and stop cracks.
Also if you can get the bulk of the mass around the edge of the wheel it will help with the flywheel effect