Bird ZSI Headset Bearing Kit headset-bearing-kit-vitus-sommet-2018-esi4519822 for all model years (apart

for all model years (apart from 2021 onwards

For all Evil Following

For Cannondale Supersix & Evo

please see our other products if you have an SL5 in another frame size

For all bikes using the FSA IS 138 Headset

Bird ZSI Headset Bearing Kit headset-bearing-kit-vitus-sommet-2018-esi4519822 for all model years (apartBoth the upper and lower headset bearings, two bearings included in sale. For all Bird bikes using the Bird ZSI Headset Bearing Kit Upper Bearing MH P03K Lower Bearing MH P25K GCR15 High Carbon Chromium Bearings: Chromium offers a corrosion resistance to the bearing, allowing you to get more use out on the trails and less time in the workshop changing bearings again due to rust and seizing. Buna NitrileRust Resistance Seals: Prevents moisture getting