Sealed Stainless Steel bearing provides extra corrosion protection. This lower headset bearing is a proprietary oversized design with inner and outer race chamfers. All 440C stainless steel construction.

Our part number SS68808SP. Replaces Trek number 281819.

40mm ID x53mm OD x 7mm Wide. 45-degree x 45-degree design.

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:

--2008-2009 5 Series Madone frames
--2008-2009 6 Series Madone frames
--2008-2011 4 Series Madone frames