Upper and lower bearing kit in 440C stainless steel for Trek Madone Frames 2010 and later. Also fits many Domane frames, as well as Trek Crockett and Cronus frames. Replaces Trek bearing numbers W531676 and W540243

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.

FITS THE FOLLOWING:
--2012+ 4 Series Madone frames
--2010+ 5 Series Madone frames
--2010+ 6 Series Madone frames
--7 Series Madone frames
--2010+ Fisher Cronus Ultimate frames
--Trek Crockett frames
--Trek Boone Frames
--Trek Emonda Frames (through 2019)