Industry Nine iRiX ZS44/ZS56 Headset : ZS44/28.6 | ZS56/40 ZeroStack Complete Black

TECH SPECS Primary Color Black Headset Position Complete Steerer Tube 1-1/8-1.5 Upper Cup 44mm S.H.I.S. ZS44/28.6 | ZS56/40 Bearing Grade Stainless Steel Lower Cup 56mm Material Aluminum Headset Type ZeroStack SHIS Lower ZS56/40 Crown Race Diameter 40mm SH