ENDURO BEARINGS Acb 4545 150 ssm - 440c stainless (angular contact) - 40x51,8x7 (45x45°)

Upgrade your bike with the high-performance ACB 4545 150 SSM angular contact headset bearing, crafted from durable 440C stainless steel for exceptional corrosion resistance. This bearing features 440C steel balls and races, ensuring long-lasting performance even in harsh environmental conditions. Its slightly smaller outer diameter of 51.8mm allows compatibility with tighter lower bearing seats in various framesets. Known in the cycling industry by part numbers such as HSS 6011, BAA0695K, TH-070, MR-128, and MH-P16, this bearing is ideal for demanding riding scenarios.

While 440C stainless steel is more expensive and requires specialized heat and cryogenic treatments, it offers superior strength, hardness, and corrosion resistance compared to standard bearing steels like 52100. This makes it an excellent choice for wet conditions or environments with sweat and spilled sports drinks. Enduro Bearings uses high-quality LLB-type seals and Almagard 3752 grease to enhance waterproofing and durability.

These bearings are comparable to those used in many top headset brands, backed by a lifetime warranty. The line features Black Oxide chromium steel races and progresses to full 440C stainless steel. Designed with large balls, dual-lip labyrinth seals, and filled with 90% waterproof grease, they provide optimal protection against the elements and wear. The angular contact design ensures even force distribution across all balls, reducing wear and extending bearing life.