Industry Nine iRiX ZS44/ZS56 Headset : ZS44/28.6 | ZS56/40 ZeroStack Complete Black MFPN=CSB-1 4-way stretch fabrication allows for

4-way stretch fabrication allows for easy pull-on and pull-off

Model Year 2021 Size 54

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Industry Nine iRiX ZS44/ZS56 Headset : ZS44/28.6 | ZS56/40 ZeroStack Complete Black MFPN=CSB-1 4-way stretch fabrication allows forTECH 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 SHIS Upper ZS44 28. 6