iRiX IS42/IS52. Item Specifications: Bearing Type, Stainless Steel, Crown Race, 40mm, S.H.I.S. Upper, 52mm, Headset type, Integrated, S.H.I.S. Upper, 42mm, Material, Aluminum, Defined Color, Blue, S.H.I.S. Designation, IS42/28.6 | IS52/40, eBay Steerer Tube Diameter, 1-1/8''-1.5'', Headset Position, Complete, S.H.I.S. Upper, IS42/28.6, S.H.I.S. Lower, IS52/40,.
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