Trek FX Sport AL models (2026+) Headset Bearing Kit- Ensure Stainless Steel/FSA/ Standard Options
This Headset Bearing Kit fits all Trek Trek FX Sport AL models from 2026+ including:-
- FX Sport AL Equipped
- FX Sport AL Equipped Midstep
- FX Sport AL 3
The kit contains two bearings of the same size in the following options:-
Enduro Stainless Steel Kit
Not all stainless steel is created equal. Enduro only uses 440C stainless steel balls and races to provide long life and superior corrosion resistance in applications and environments that may be less than ideal. 440C has the highest strength, hardness, and wear resistance of all the standard 440-series stainless alloys with high carbon content. As expected, it is also the most expensive of the 440 series alloys and requires special heat treatment and cryogenic treatment to achieve its superior mechanical properties. Though it is slightly softer than our standard 52100 chromium steel used in most of our bearings, stainless steel is an excellent alternative for use in wet conditions or where sweat and spilled sports drinks can be a problem. Enduro Bearings also uses LLB-type seals and Almagard 3752 grease in these bearings to additionally waterproof against the elements. Enduro 440C stainless headset bearings are the same bearings found in many popular headset brands with a lifetime warranty.
FSA (Full Speed Ahead) Kit - As used by Trek
FSA headset bearings are high-quality, precision-engineered components designed to deliver smooth steering and long-lasting performance for both road and mountain bikes. These Angular Contact Bearings (ACB) are built to handle the unique combination of axial and radial loads placed on a bike's front end, ensuring stability even under intense riding conditions.
Standard Kit
Material: Chrome Steel
W540243
