... 16" * 25.4mm = 406.4mm 245mm * 0.45 = 110.25mm 406.4mm + 110.25mm + 110.25mm = 626.9mm overall diameter18" * 25.4mm = 457.2mm 285mm * 0.3 = 85.5mm 457.2mm + 85.5mm + 85.5mm = 628.2mm overall diameter 285mm * 0.35 = 99.75mm 457.2mm + 99.975mm + 99.975mm = 656.7mm overall diameter
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