Full Speed Ahead NO.10 Internal Headset 1.6/8.9 Black No.10 PSI-80 With polyester lining and G-loft

With polyester lining and G-loft insulation for extra warmth

Color Black Flat Protection Sidewall TPI 60 Weight 845 Defined Color Black ISO Width (mm) 58 ISO Diameter 584 / 650b / 27

In colder temperatures

Our Drop-Stop® chainrings pair with these cogs for the ultimate single speed drivetrain

Full Speed Ahead NO.10 Internal Headset 1.6/8.9 Black No.10 PSI-80 With polyester lining and G-loftFull Speed Ahead NO. 10 Internal Headset 1. 6 8. 9 Black No. 10. Internal ZS headset for 1 1 8? steerer with alloy top cover. Cup & cone bearings TECH SPECS Color Black Lower Stack Height 3. 7 Bearing Type Cup and Cone Crown Race 30 Defined Color Black Upper Stack Height 5. 2 S. H. I. S Upper ZS44 S. H. I. S. Stem Clamp Diameter 28. 6 Threadless S. H. I. S Lower ZS44