ENDURO 440C STAINLESS STEEL "ACB 1-INCH" LOWER BEARING 27.1MM X 38MM X 6.5MM USED ON TREK SPEED CONCEPT

440C stainless steel balls and races 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. This is the lower headset bearing for the Trek SPEED CONCEPT frames.