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The Enduro Bearings 3645 5063 ACB is a premium angular contact headset bearing engineered for durability and precision. Crafted from 440C stainless steel, this bearing offers exceptional corrosion resistance, making it ideal for demanding environments where moisture and sweat are concerns. Its dimensions of 50x62x8 mm and 36 x 45 degrees contact angle make it a perfect fit for high-performance steering systems, including those specified for Giant Reign e+ series bikes.
Unlike standard stainless steel, the 440C alloy used in these bearings has the highest strength, hardness, and wear resistance within the 440-series stainless steels. Achieving these superior mechanical properties involves meticulous heat and cryogenic treatments. Enduro Bearings complement this robust material with LLB type seals and CRC Marine Grease, ensuring reliable waterproofing and long-lasting performance. This combination provides peace of mind for riders who frequently wash their bikes or ride in wet conditions.
Designed with the largest possible balls and dual lip seals riding in a micro-groove, these angular contact bearings spread forces evenly across all balls, reducing pressure and wear. Filled to 90% with high-pressure waterproof grease, they guarantee consistent lubrication and protection against the elements. Enduro’s 440C stainless steel headset bearings are trusted by many top headset brands and come with an impressive reputation for longevity and reliability.
What makes 440C stainless steel better than other stainless steels for bearings?
440C stainless steel combines high carbon content with advanced heat treatments, resulting in superior hardness, strength, and wear resistance compared to other 440-series alloys. This makes it ideal for bearings exposed to moisture and corrosive elements.
Can I use these bearings for mountain biking in wet conditions?
Absolutely. These bearings are designed specifically to withstand wet and harsh conditions, thanks to their corrosion-resistant 440C stainless steel construction and waterproof sealing with CRC Marine Grease.
Stock Status Instock - Instore - Item Usually shipped or available for shop collection, within 48 hours (Mon-Fri)
Instock - Supplier Warehouse - Item is held in Suppliers Warehouse, Depending on the the supplier transfer time can vary from 24 Hours to 14 Days for item held in European warehouse.
(over festive periods some suppliers shut from 24th Dec-2nd Jan so orders can be delayed through this period.)
Brands held in European website include Trek, Bontrager, Electra, Wahoo, Rapha. For up-to-date transfer times please call customer services on +44 (0)1782 768622
Most out products are shipped by FedEx, providing unprecedented reliability and speed. Lightweight Spares below £25.00 value have a Royal Mail postage option, which is sent via Tracked 48 service. - £2.99
Shipping on all Domestic Orders over £50.00 (excluding bikes and home trainers) for delivery within the UK is completely FREE!
Bike and Home Trainers and oversize Goods £15.00 - FedEx
White Glove Bike Delivery - our white glove option has your bike personally delivered to you by a fully trained Mechanic and Bike fitter - £99.99
(Certain bikes will only have this option such as Cargo Bikes)
To Qualify for FREE Shipping:
In some cases, we may ship items out with another courier, depending on the status and availability of items ordered. (Customers will not be charged more and will be refunded any unused postage cost) If part of an order is cancelled and the total drops below the £50.00 free postage, a postage charge may be taken.
Delivery costs will be clearly stated on the checkout page, though you will need to register (to provide your delivery address) in order to see the delivery costs.
If you have any questions about delivery charges, times or none delivery please do not hesitate to get in touch by email:store@swinnertoncycles.co.uk or by telephone on +44 (0)1782 768622. Handling is normally 48 hours, but at busy periods this may be extended but we will endeavor to process your order within 5 working days. Please bear in mind in some cases orders can take longer to process, please contact us for more details.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.