NEW Ritchey Logic 1-1/8" Threaded Headset: EC34/28.6 EC34/30, Silver shifter_12speed thanks to the spine mount

thanks to the spine mount and lock ring design

The EC90 SL takes the proven Fantom rim shape and scales it down to a shallower 38-millimeter depth

Also compatible with Shimano/SRAM 8-10sp cassettes with spacer

FULL PIN technology uses ten lightweight

NEW Ritchey Logic 1-1/8" Threaded Headset: EC34/28.6 EC34/30, Silver shifter_12speed thanks to the spine mountTraditional threaded headset with loose bearings in a race. Smaller upper bearing to save weight Lightweight, precision machined aluminum cups Deep cups for solid insertion Upper Stack Height: 26 S. H. I. S. Stem Clamp Diameter: 28. 6 26tpi Quill Defined Color: Silver S. H. I. S Lower: EC34 Weight: 140 Crown Race: 30 Bearing Type: Cup and Cone Color: Silver Black S. H. I. S Upper: EC34 Lower Stack Height: 10. 7