Tange Terious FATTY MX STR headset. Heavy duty, oversized chromoly lower cup for dirt jumping. This headset is for 1 1/8" threadless systems. The cups fit in an approx. 33.5mm frame headtube. This headset is brand new, never installed. * Fork size: 28.6mm (1 1/8" threadless) * Upper cup O.D.: 44.74mm (this headset is gyro compatible) * For frame headtube I.D.: 34.0mm * Crown race I.D.: 30.0mm * Stack height: 24.9mm (add this to your head tube length and stem height to determine minimum length steer tube you need on your fork). * Weight: 199g (includes top cap, star nut and Potts Mod bolt) * Sealed mechanism (NOT fully sealed - sealed mechanism means there are plastic and rubber seals that seal the moving parts of the headset) * Hollow "Potts Mod" bolt - to route front brake cable through the fork. * MADE IN JAPAN