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FR-S and GC have similar suspension architecture, they don't have "the same suspension". Geometry and spring/damping/swaybar rates are very important!
From a tire width per vehicle weight perspective,
GC ~3450+200lb/(2x225+2x245) = 3.88 lb/mm
FR-S ~2700+200lb/(4x215) = 3.37 lb/mm
15% more tire per weight, slight handling advantage to the FR-S *if on the same make/model tires*, and *assuming* equivalent suspension.
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