Industry Nine iRiX IS41/IS52Attributes Crown Race Diameter 40mm Headset Type Integrated Material Aluminum SHIS Lower IS52 40 Bearing Grade Stainless Steel SHIS Upper IS41 28. 6 Upper Cup 41mm Headset Position Complete Lower Cup 52mm S. H. I. S. IS41 28. 6 IS52 40 Steerer Tube 1 1 8'' 1. 5''
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