Promax PI-1 Alloy Sealed Bearing 1" Press in Headset Black. The PI-1 Alloy 4545 headset has an aluminum top cap upper bearing cover lower race and upper and lower cups. All-aluminum construction results in a lightweight headset. Each headset is fitted with
Promax PI-1 Alloy Sealed Bearing 1″ Press in Headset Black. The PI-1 Alloy 4545 headset has an aluminum top cap upper bearing cover lower race and upper and lower cups. All-aluminum construction results in a lightweight headset. Each headset is fitted with super-smooth rolling precision 4545 angular-contact sealed bearings.
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