Description

ROTOR Kapic Boost Axle – Precision Spindle for Modular Cranks
Elevate your mountain bike´s performance with the ROTOR Kapic Boost Axle, the foundational spare part for building a lightweight, stiff, and highly efficient drivetrain. Designed as the heart of the modular KAPIC crank system, this axle is engineered for riders who demand precision, reliability, and the ultimate in customization. Whether you are building a new bike, upgrading your current setup, or replacing a component, the Kapic axle provides the core strength and advanced technology ROTOR is renowned for.
The true advantage of the ROTOR ecosystem lies in its modularity. The KAPIC aluminium Cranks are compatible with Boost (L141) axles and Standard axles (L135), giving you the flexibility to adapt your crankset to different frame standards. This Boost-specific axle is your key to achieving a perfect chainline on modern mountain bike frames, ensuring crisp shifting and optimal drivetrain performance.
Flawless Power Transmission
At the center of its design, the KAPIC’s axle features a cleverly designed spline interface when mounted to Direct Mount chainrings. This proprietary connection delivers a robust yet smooth engagement, allowing you to maximise the efficiency in transmission of power in your pedal rotation. Every watt of power you produce is transferred directly to the drivetrain without loss or flex, giving you a tangible advantage on climbs and sprints. This secure connection ensures a silent, creak-free ride and the confidence to push your limits.
Unrivaled Adjustability with OCP Mount
Combined with our new modular KAPIC cranks and Q RINGS oval chainrings or Round chainrings, the innovative axle includes refined OCP Mount technology so you can now adjust your optimal chainring position by precise one-degree increments. This groundbreaking feature allows you to fine-tune your oval chainring to your unique pedaling style, helping to reduce knee stress, increase power output, and smooth out your pedal stroke for maximum efficiency over long distances and technical terrain. Unlock a level of personalization previously unavailable and find your perfect power spot.
Axes
This axle is the central component that defines your crankset´s chainline and compatibility. The KAPIC modular system allows for simple interchangeability between different axle lengths to fit various frame standards. This specific model is the Boost (L141) version, designed for frames with 148mm rear hub spacing. The system is also compatible with Standard (L135) axles for non-Boost frames.
Technical Specifications:
– Crank Axle Compatibility: L141
– crank_axle_compability: No
– UBB Compability: BB30, BSA, PRESS FIT 30, PRESS FIT 4130, PRESS FIT 4630, UBB30
– BCD: No
– Crank Length: No
– Axle Width: 30 mm