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Chrome moly steel kart frames crack because they act as the suspension so they have to flex to a fairly significant degree - the same happens (albeit more slowly) with steel bicycle frames. In both cases, a mild steel frame that could handle the loads would be far too heavy for competition.
A strut brace should be made stiff enough not to flex much else it is non-functional. The difference in weight between mild steel and chrome moly steel versions may not be significant, though, as the brace acts in compression so the wall thicknesses needs to be high enough to prevent buckling. A carbon fibre cross bar could be made both light and strong enough but the cost may be prohibitive (though the lay up would be pretty simple).
Glass in brakes doesn't sound likely since it is an excellent insulator and aluminium alloys soften at brake rotor operating temperatures. Still, it wouldn't surprise me too much if some interesting breakthoughs have been made.
A strut brace should be made stiff enough not to flex much else it is non-functional. The difference in weight between mild steel and chrome moly steel versions may not be significant, though, as the brace acts in compression so the wall thicknesses needs to be high enough to prevent buckling. A carbon fibre cross bar could be made both light and strong enough but the cost may be prohibitive (though the lay up would be pretty simple).
Glass in brakes doesn't sound likely since it is an excellent insulator and aluminium alloys soften at brake rotor operating temperatures. Still, it wouldn't surprise me too much if some interesting breakthoughs have been made.
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