The S4 is the ultimate engineering marvel. Three steel dies and 18,000 lbs. of pressure are used to forge the centers out of a solid block of aircraft grade 6061-T5 alloy. The rim halves are cold spun from an extruded sheet of aluminum, then individually polished to a high sheen. each S4 is assembled by hand to your exacting specifications using thirty 12-point aerospace fasteners. The S4 is available in 19" and 20" diameters and widths ranging from 8" to 14".

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