轮辋内部：更为人熟知的部件之一。当赛车在赛道上行驶时，这个部件需要足够坚固，以应对惊人的负载和高转速，但也必须足够轻，以确保最佳速度。此部件直径为18英寸，符合当前国际汽联的规定，但轮圈和轮胎的总重仅10kg。
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