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Enduro Sealed Angular Contact Headset Bearing 4545 136 SS - 1 1/4" - 32.75 x 41.75 x 6mm (45 x 45 deg)

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ACB 4545 136 SS - 1 1/4" 440C Stainless Steel Angular Contact Headset Bearing - 32.75 x 41.75 x 6mm (45 x 45 deg)

Not all variations of stainless steel share the same qualities.

Enduro exclusively utilizes 440C stainless steel balls and races to ensure prolonged durability and superior resistance against corrosion, especially in challenging applications and environments. Among the standard 440-series stainless alloys boasting high carbon content, 440C stands out for its exceptional strength, hardness, and wear resistance. As anticipated, it also happens to be the most expensive alloy within the 440 series and requires multiple rounds of heat treatment and cryogenic processes to attain its superior mechanical properties. Despite having a 20% lower load capacity and being slightly softer compared to our standard 52100 chromium steel prevalent in most of our bearings, stainless steel serves as an excellent alternative, particularly in wet conditions, frequent bike washes, or environments prone to perspiration. Additionally, Enduro Bearings incorporates LLB-type seals and CRC Marine grease in these bearings to provide additional waterproofing against environmental elements. Enduro 440C stainless headset bearings are identical to those featured in numerous well-known headset brands, some of which offer an impressive 110-year warranty.

The Enduro range of angular-contact headset bearings commences with Black Oxide-treated Chromium Steel races, progresses to full 440C stainless steel, and culminates in the highest-grade XD-15 aerospace-stainless (both races and balls) backed by a lifetime guarantee. These bearings are consistently engineered to accommodate the largest possible balls, incorporate dual-lip seals traversing a micro-groove (labyrinth), and are filled up to 90% with high-pressure waterproof grease, ensuring unparalleled protection against perspiration and environmental elements. Enduro Angular Contact (A/C) bearings are intricately designed to engage all balls, effectively distributing force over a larger surface area, thereby minimizing wear and maximizing the bearings' lifespan.

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