Please note that this bearing has slightly different dimensions from the other ACB 6808 bearings we sell, it has a slightly smaller OD and has 36 degree chamfers internally and externally. It was originally spec'd by Trek on Madone and Domane bikes.
This size bearing is also known in the bike industry by these part numbers:
• 290413
• HD 1449
• S417578
• MR-006 S
ACB 6808 SS | Stainless Steel 440C Angular Contact
In standard radial bearings, only three or four of the balls make contact during load. But Enduro angular contact bearings work differently. When properly installed and adjusted (black seal facing in), Enduro angular contact bearings engage all of the bearing's balls to spread the force over a larger surface area, decreasing friction, minimizing wear and increasing bearing life.
This size bearing is also known in the bike industry by these part numbers:
• 307481
• W 276442
ACB 276442 BO | Stainless Steel 440C Angular Contact Black Oxide
Angular-contact headset bearing featuring anti-corrosion Black oxide/Magnetite treated 52100 High-Carbon Chromium alloy races paired with grade 10 Balls. Black Oxide treatment provides an extra level of corrosion resistance and extended worry-free performance
Black Oxide-treated Chromium Steel for toughness and corrosion resistance.
Stainless steel for even better rust resistance.
Polished for a super smooth surface to reduce friction.
Large balls spread the load, making the bearings last longer and work smoother.
Special seals keep dirt and moisture out, keeping the bearings clean and protected.
Filled with special grease to protect against water and sweat.
This size bearing is also known in the bike industry by these part numbers:
• 307481
• W 276442
ACB 276442 SS | Stainless Steel 440C Angular Contact
In standard radial bearings, only three or four of the balls make contact during load. But Enduro angular contact bearings work differently. When properly installed and adjusted (black seal facing in), Enduro angular contact bearings engage all of the bearing's balls to spread the force over a larger surface area, decreasing friction, minimizing wear and increasing bearing life.
Deep groove design stainless steel alloy races
Grade 10 balls (stainless steel)
Fill with high pressure waterproof grease
Long life and superior corrosion resistance
Excellent use in wet conditions
Two years anti-corrosion warranty
Static load: 320lbf/ 1.42kN
Weight: 8g
20% less load capacity of stainless steel
Slightly softer than standard 52100 chromium steel used
This 1-1/2 Angular contact Bearing for Internal Headset featuring 52100 High-Carbon Chromium alloy races paired with grade 10 balls for (Cannondale Lefty).
B 543 2RS | Angular Contact
In standard radial bearings, only three or four of the balls make contact during load. But Enduro angular contact bearings work differently. When properly installed and adjusted (black seal facing in), Enduro angular contact bearings engage all of the bearing's balls to spread the force over a larger surface area, decreasing friction, minimizing wear and increasing bearing life.
Deep groove design black-oxide treated 52100 high-Carbon Chromium alloy races (extra level of corrosion resistance)
This size bearings also known in the bike industry by these part numbers:
• HD 1448
• 281819
S68808 SP | Stainless Steel 440C Angular Contact
In standard radial bearings, only three or four of the balls make contact during load. But Enduro angular contact bearings work differently. When properly installed and adjusted (black seal facing in), Enduro angular contact bearings engage all of the bearing's balls to spread the force over a larger surface area, decreasing friction, minimizing wear and increasing bearing life.
