Enduro Bearings ACB 4545 1125 BO - ABEC 5 - Black Oxide (Angular Contact) - 30.5x41.8x6.5 (45x45°)

We do not recommend bearings for inferior headset ranges. Instead, we start with chrome steel, Black Oxide A/C, and finally, 440C stainless steel bearings. They are always constructed with the largest possible balls, and their double-lip seals are seated in a small recess for ultimate protection against sweat and the (natural) elements. They are 90% filled with high-pressure grease, so you don't have to wonder if there's grease inside. BLACK OXIDE: Enduro bearings use 52100 chrome alloy raceways with high carbon content that have received thermal and cryogenic treatment. This means that everything is brought to a temperature of -190°, which ensures a certain hardness and thus reduces ball wear. We then give the bearing a magnetic treatment (black or Black Oxide color) which provides corrosion protection and easy assembly. The raceways are further polished after treatment to ensure the smoothest possible raceway. These are the best bearings for the suspension swingarm.

Article number ACB45451125BO EAN 810191013471 Brands Enduro Bearing height (mm) 6.5 Inner diameter bearing (mm) 30.5 Outer diameter bearing (mm) 41.8 Bearing outer angle (°) 45 Type ACB BLACK OXIDE ACB 4545 1125 BO - 1-1/8" Angular Contact Bearing with Black Oxide Upgrade your bike with the high-quality ACB 4545 1125 BO angular contact bearing, designed for durability and precision. This 30.5 mm x 41.8 mm x 6.5 mm bearing has a 45°x45° contact angle, ensuring optimal load distribution and a longer lifespan. Coated with anti-corrosion Black Oxide/Magnetite, it offers superior resistance to rust and harsh weather conditions. Made from 52100 high-carbon chromium alloy with grade 10 balls, it guarantees smooth operation and long-lasting performance. All Enduro Black Oxide bearings come with a two-year warranty. Known in the bicycle industry under part numbers such as MR042, 870E, MR121, MR070, MR084, MR116, TH-870E, and MH-P08, suitable for various high-performance mountain bikes and road bikes. The Enduro series offers two performance levels: entry-level models with premium Black-Oxide treated races and a two-year warranty, and premium stainless steel bearings with a lifetime warranty. All bearings are designed with large balls and double-lip labyrinth seals for maximum protection against sweat, water, and dirt, ensuring reliable long-term performance. The Angular Contact (A/C) design distributes the load across all balls, reducing premature wear and significantly extending lifespan. The static load capacity is 980 lbf / 4.35 kN, with a weight of 19.24 g.