Mostly design intent. The UP-02 evolves the classic Tesla turbine look with a twisted split 5-spoke face and open airflow for the brakes. The UP-04 is sharper and more angular, with stepped machining and center buttressing for a modern, aggressive look. Both are 6061-T6 forged and both bolt on without spacers across the 18 to 21 inch range. Choose UP-02 for turbine-inspired familiarity, UP-04 for edgy geometry.
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