Trek Fuel Ex, Fuel, Top Fuel, Procaliber Headset Bearings Kit headset-bearing-kit-specialized-fuse-2015-esi5011615 Alloy Bikes

Alloy Bikes

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For all Santa Cruz Blur Bikes

and you are still not 100% sure

For Specialized Tarmac SL2 & SL3 Bearings

Trek Fuel Ex, Fuel, Top Fuel, Procaliber Headset Bearings Kit headset-bearing-kit-specialized-fuse-2015-esi5011615 Alloy BikesBoth the upper and lower headset bearings, two bearings included in sale. For all Trek Fuel Ex, Fuel, Top Fuel, Procaliber bikes, compatible with all model years. Upper Bearing MH P03K Lower Bearing ACB518K 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