Thomson X4 Stem MTB Headset 90mm x 90mm Fits the following Park Tool

Fits the following Park Tool repair stands with PCS-EXT Repair Stand Extension for PCS-1 and PCS-4: PCS-1 (06/1996 to 01/2004) PCS-4 (pre-01/2003)

shells 68mm to 100mm

MV Easy head is compatible with all valve types

grease and grime

Thomson X4 Stem MTB Headset 90mm x 90mm Fits the following Park ToolOne piece of solid 7000 series aluminum extruded billet precision machined by Thomson in Macon Georgia. Features a traditional steerer clamp that is shaped to save weight and to be knee friendly. Thomson stems are the strongest in the industry meaning enduro and downhill riders can run them confidently. Superior balance and combination of strength stiffness and weight TECH SPECS Type MTB Headtube Quill Diameter 1 1 8` Length 80 Bar Clamp Diameter 31.