Rotor ALDHU crank arms

Rotor ALDHU Track crank begins with 3D CNC machining of top-tier 7075-aeronautic grade aluminum to ensure unmatched rigidity.

Utilizing a special manufacturing process named the “Trinity Drilling System", where an extruded aluminum bar is intricately CNC machined with three internal holes through the length of the crank, the result is a unique triple hollow crank arm that enables Rotor’s engineers to remove the excess aluminum in the core, resulting in exceptionally light weight while still maintaining structural strength.

ALDHU crank arms must be paired with the Rotor Track30 Spider & Axle (sold separately).

 

ⓘ Professional assembly and installation using a torque wrench and following all published torque specifications is strongly recommended. 

Specifications

• length: 165mm, 170mm

• chainline: 43mm

• Q-factor: 140mm

• includes preload collar and auto-extractor bolts 

• required bottom bracket: Rotor BSA30 Track (sold separately)

• color: black

• weight: 334g (165mm), 350g (170mm)

Bottom bracket compatibility

Rotor AHLDU and VEGAST Track cranks must be used with Rotor’s BSA30 Track bottom bracket, which has thinner external cups than all other outboard bottom brackets designed for use with a 30mm axle.

Using a bottom bracket with thicker cups may technically seem possible, but the back of the disc spider will contact the drive side cup once installed and the non-drive side cup won’t leave enough of the axle splines exposed to properly secure the left crank arm, damaging the mounting interface.