Descriptions

The RISK RT144 / RT145 Titanium Center Lock Disc Rotor Lockring is a lightweight and durable replacement lockring designed for bicycle Center Lock disc brake rotors. Made from titanium alloy, it offers excellent strength, low weight, and premium corrosion resistance for road bikes, gravel bikes, and other Center Lock wheelsets.

This product is available in internal spline type RT144 and external spline type RT145, both with M31 × P1.0 thread specification and supplied with a matching washer. The hollowed-out structure helps reduce weight while maintaining a secure rotor locking function.

The lockring is available in oil slick / rainbow, gold, and black color options, making it suitable for both performance upgrades and custom bike builds.

Key Features

Titanium Alloy Construction
Lightweight, durable, and corrosion-resistant titanium material.
Center Lock Rotor Compatible
Designed for Center Lock disc brake rotor installation on compatible hubs.
Internal & External Lockring Options
Choose RT144 internal spline type or RT145 external spline type according to your hub and tool compatibility.
M31 × P1.0 Thread Specification
Standard thread size for compatible Center Lock rotor hubs.
Includes Washer
Each lockring includes a washer for proper installation.
Lightweight Hollow Design
Hollowed-out structure helps reduce weight while keeping a strong locking surface.
40 N·m Torque Marking
Clearly marked recommended locking torque for installation reference.
Multiple Color Options
Available in rainbow / oil slick, gold, and black.
Ideal for Road and Gravel Bikes
Suitable for Center Lock disc brake wheelsets used on road, gravel, cyclocross, and performance bikes.

Product Specifications

Item	Model	Type	Thread	Outer Diameter	Thickness	Tool Compatibility	Approx. Net Weight	Package Size	Approx. Package Weight
Titanium Center Lock Lockring	RT144	Internal spline / Internal lock	M31 × P1.0	40 mm	7 mm	Shimano LR15 or compatible internal spline tool	6.3 g	15 × 9 × 0.5 cm	11 g
Titanium Center Lock Lockring	RT145	External spline / External lock	M31 × P1.0	44 mm	7.4 mm	Shimano TL-FC32 or compatible external BB tool	7.5 g	15 × 9 × 0.5 cm	12 g

Product Options / Variants

RT144 — Internal Spline Center Lock Lockring

Model: RT144
Type: Internal lock / internal spline
Thread: M31 × P1.0
Outer diameter: approx. 40 mm
Total thickness: approx. 7 mm
Tool compatibility: Shimano LR15 or compatible internal spline lockring tool
Net weight: approx. 6.3 g
Package weight: approx. 11 g
Included: 1 lockring with washer

Available colors:

Oil Slick / Rainbow
Gold
Black

RT145 — External Spline Center Lock Lockring

Model: RT145
Type: External lock / external spline
Thread: M31 × P1.0
Outer diameter: approx. 44 mm
Total thickness: approx. 7.4 mm
Tool compatibility: Shimano TL-FC32 or compatible external bottom bracket tool
Net weight: approx. 7.5 g
Package weight: approx. 12 g
Included: 1 lockring with washer

Available colors:

Oil Slick / Rainbow
Gold
Black

Package Includes

Depending on the selected option:

1 × Titanium Center Lock Disc Rotor Lockring
1 × Matching Washer

Note: Product images may show disc rotors, hubs, wheels, or tools for demonstration only. The package includes only the selected lockring and washer.

Installation Notes

Recommended tightening torque: 40 N·m
Thread specification: M31 × P1.0
Please confirm hub, axle, rotor, and tool compatibility before purchase.
RT144 internal type uses an internal spline lockring tool such as Shimano LR15 or compatible tools.
RT145 external type uses an external spline tool such as Shimano TL-FC32 or compatible tools.
Do not force installation if the thread or tool interface does not match.
Professional installation is recommended.