Headset Bearing Enduro ACB 4545 125T SS 34.1x46x7 (45x45°)

Headset Bearing Enduro ACB 4545 125T SS 34.1x46x7 (45x45°)

The Enduro ACB 4545 125T SS is a premium angular contact headset bearing designed for maximum durability and reliability in demanding riding conditions. It features 440C stainless steel balls and races, offering outstanding corrosion resistance and extended service life.

Not all stainless steel is the same — Enduro exclusively uses 440C stainless steel, which provides the highest strength, hardness, and wear resistance of all standard 440-series stainless alloys. Although more expensive and requiring specialized heat and cryogenic treatment, 440C delivers superior mechanical performance.

While slightly softer than Enduro’s standard 52100 chromium steel bearings, 440C stainless steel is an excellent choice for wet environments or situations where sweat and spilled sports drinks may accelerate corrosion. To further enhance protection, these bearings use LLB-type seals and Almagard 3752 waterproof grease to keep moisture and contaminants out.

Enduro angular contact headset bearings are engineered so that all balls are evenly engaged, distributing load over a larger surface area to minimize wear and maximize bearing life. They feature the largest possible balls, dual-lip labyrinth seals, and are filled up to 90% with high-pressure waterproof grease. 

• Type: Angular Contact Headset Bearing
• Dimensions: 34.1 x 46 x 7 mm
• Contact angles: 45° x 45°
• Material: 440C stainless steel balls and races
• Seals: LLB-type dual seals
• Grease: Almagard 3752 waterproof grease
• Static load rating: 4.35 kN (980 lbf)
• Weight: 25.5 g
• Alternate part numbers: ACB460H7, MR238