Rotor Aldhu Direct Mount Crank Arms

The Rotor Aldhu Direct Mount Crank Arms are engineered for cyclists who demand precision, efficiency, and versatility from their drivetrain. Designed with ROTOR’s advanced direct mount technology, these crank arms provide exceptional power transfer for improved pedaling performance on every ride. The innovative spline interface allows seamless integration between the crank arm, axle, and chainring, making installation and maintenance simple and efficient. Built from premium 7055 aluminium, the Aldhu crank arms offer an excellent balance of strength, durability, and lightweight performance. Their modular design gives riders the flexibility to select and swap chainrings with ease, adapting their setup to different riding conditions. Inspired by ROTOR’s rich racing heritage, these crank arms combine professional-level engineering with everyday reliability, making them an outstanding upgrade for road cyclists seeking superior drivetrain performance.

Key Features

• Direct Mount Design: Maximizes power transfer for efficient pedaling performance

• Modular System: Easily change chainrings to suit different riding styles and terrain

• Spline Interface: Proprietary connection between crank arm, axle, and chainring for simple assembly

• Single Bolt Installation: Quick chainring removal and installation with only one bolt

• Q RINGS Compatible: Supports ROTOR Q RINGS with OCP technology for personalized performance tuning

• Round Chainring Compatible: Works with traditional round chainrings as well

• Lightweight Construction: Manufactured from premium 7055 aluminium for strength without excess weight

• Race-Inspired Engineering: Developed from ROTOR’s professional racing experience

Product Specifications

• Product Type: Direct Mount Crank Arms

• Brand: ROTOR

• Series: Aldhu

• Available Sizes: 170 mm, 172.5 mm, 175 mm

• Material: 7055 Aluminium

• Q-Factor: 148 mm / 153 mm depending on axle choice and rim or disc setup

• Chainline: 43.5 mm / 46 mm depending on axle choice and rim or disc setup

• Compatibility: BSA30, ITA30, BB30 Bearing Kit, PRESS FIT 4630, UBB4630, BB386, PRESS FIT 4130

Modular Chainring System

The Aldhu crank arms are built around a highly adaptable modular platform. Riders can quickly select and install the ideal chainring size for specific rides, whether focused on climbing, endurance, training, or racing. The direct mount system simplifies drivetrain customization while maintaining excellent stiffness and reliability. Compatibility with both ROTOR Q RINGS and traditional round chainrings gives cyclists the freedom to tailor their setup according to their riding preferences and performance goals.

Easy Operation / Usage

• Install the crank arms using a compatible bottom bracket system

• Mount the preferred chainring using the direct mount interface

• Secure the chainring with the single-bolt system

• Adjust and maintain the drivetrain as needed for optimal performance

• Swap chainrings easily when changing riding conditions or gearing requirements

Why Choose This Product

• Delivers efficient and reliable power transfer

• Lightweight yet highly durable aluminium construction

• Flexible modular design for easy customization

• Supports advanced ROTOR Q RINGS technology

• Simple installation and chainring replacement process

• Developed using knowledge gained from professional racing

• Compatible with a wide range of bottom bracket standards

In the Box

• Rotor Aldhu Direct Mount Crank Arms