Industry Nine iRiX IS42/IS52 Headset : IS42/28.6 | IS52/40 Integrated Complete Black MFPN=00.6118.563.004 while lower assemblies include split

while lower assemblies include split crown race

proven to reduce neck forces and neck injuries through transferring the load during an accident away from the fragile bones in the neck

5 Rim Depth (mm) 18

ETRTO 584-30

16mm-12mm concave profile with 20 preassembled steel pins for added grip

Industry Nine iRiX IS42/IS52 Headset : IS42/28.6 | IS52/40 Integrated Complete Black MFPN=00.6118.563.004 while lower assemblies include splitTECH SPECS Crown Race Diameter 40mm Headset Position Complete Lower Cup 52mm Bearing Grade Stainless Steel Headset Type Integrated Primary Color Black S. H. I. S. IS42 28. 6 IS52 40 Steerer Tube 1 1 8 1. 5 SHIS Upper IS42 28. 6 Upper Cup 42mm Material Aluminum SHIS Lower IS52 40