Shimano SM-HB20 Centerlock lockring for 15/20 mm thru axles (BULK)

Shimano Centerlock lockring for thru axles

The Shimano SM-HB20 Centerlock lockring reliably secures your brake rotor to hubs with 15 or 20 mm thru-axles and ensures a solid, confidence-inspiring braking feel on any trail. It combines low weight with high stability, making it the ideal choice for sporty riders who want to rely completely on their equipment.

Secure brake disc mounting for modern thru axles

The lightweight aluminum Centerlock lockring is used to secure Centerlock brake rotors on hubs with 15 mm or 20 mm thru axles and replaces conventional internal lockrings, which are often no longer accessible on thru axles. Thanks to the external teeth, the ring can be easily tightened with a standard Hollowtech II bottom bracket wrench (e.g. TL-FC36/TL-FC32) and guarantees a secure connection between the hub and brake rotor with no play.

Lightweight, robust and versatilely compatible

Made from high-quality 6061 aluminum, the lockring offers an attractive ratio of weight of around 10 g and high rigidity. It is suitable for a wide range of Centerlock hubs from Shimano, DT Swiss, Fulcrum, Mavic and other brands and is particularly recommended for front wheel hubs with 15 and 20 mm thru axles.

Perfect for ambitious trail and all-mountain riders

Especially on demanding descents or in the bike park, the stable lockring ensures that your brake rotor stays where it belongs – even under high thermal and mechanical stress. The robust construction and easy handling make it a favorite for anyone who screws a lot, uses different wheels or regularly adjusts their setup.

specification

Scope of delivery

• 1 x Shimano SM-HB20 Centerlock external lockring
• 1 x washer for brake disk assembly

Here’s what we think about it

The Centerlock lockring is described by many users as a reliable and uncomplicated solution for securely mounting brake rotors on thru-axle hubs. One rider praises the fact that the ring is “made exactly for this job” and noticeably enhances the system because everything feels solid and free of play.

Another user emphasizes that the locking ring is practically indispensable, especially with 15 mm thru axles, if you want to mount a Centerlock brake rotor cleanly. Overall, the product is perceived as robust, easy to fit and very inexpensive in relation to its benefits, making it a small but important component for a carefree braking experience.