CLARKS CENTRELOCK EXTERNAL LOCKRING

The Clarks CentreLock External Lockring provides a secure and reliable connection between your disc brake rotor and wheel hub. Engineered from high-strength alloy, this lightweight component is essential for modern disc brake setups, managing the intense torsional forces generated during heavy braking.

Unlike internal lockrings which interface on the inside of the ring, this external variant features splines on the outer edge. This design provides maximum clearance for larger axle standards, including 12mm, 15mm, and 20mm thru-axles, where a standard cassette tool may struggle to fit inside the axle bore. It tightens down using a standard 16-notch external bottom bracket tool, ensuring an easy, slip-free installation to the recommended 40Nm torque specification.

Key Features

• External Spline Design: Positioned on the outer circumference to clear oversized thru-axles and hub caps easily.

• High-Strength Alloy Construction: Crafted from lightweight yet durable aluminium to withstand high braking torque without stripping.

• Universal Hub Compatibility: Designed to work seamlessly with all major standard CentreLock hubs and rotors.

• Secure Thread Engagement: Precision-machined threads prevent loosening over time, maintaining consistent rotor alignment.

• Standard Tool Interface: Utilises a common 16-notch, 44mm external bottom bracket tool for straightforward installation and removal.

Specifications

• Material: Aluminium / Alloy

• Hub Compatibility: CentreLock

• Spline Location: External (Outer edge)

• Tool Requirement: 16-notch, 44mm external bottom bracket tool (e.g., Park Tool BBT-69.4)

• Recommended Torque: 40Nm

• Axle Compatibility: Quick Release, 12mm, 15mm, and 20mm Thru-Axle

☀️ Why This IS For You

• Thru-Axle Rider: You run a 15mm or 20mm front thru-axle, where an internal cassette-style lockring tool cannot clear the wide axle opening.

• Workshop DIYer: You already own a standard 16-notch external bottom bracket tool, saving you from purchasing a specialized deep cassette tool.

• Stripped Thread Safety: The deep external splines provide a much more positive tool engagement, minimizing the risk of slipping and rounding out the notches.

⚠️ Why This May NOT Be For You

• Ultra-Tight Frame Clearance: Some specific road or gravel bike forks have incredibly tight tolerances where an external lockring might rub against the frame; an internal lockring is preferred here.

• Only Have Cassette Tools: If you only own a standard cassette lockring tool and have a standard quick-release or 12mm axle, an internal lockring will match your current toolbox.

BFC PRO TIP When installing your external lockring, always use a dedicated bottom bracket tool that attaches to a 3/8-inch socket ratchet paired with a torque wrench. Because disc rotors endure extreme heat and vibrations, guessing the tightness by hand can lead to a loose rotor or stripped hub threads. Click it precisely to 40Nm, and place a tiny smear of anti-seize grease on the lockring threads before installation to prevent it from seizing up after wet winter rides!