5DEV R-SPEC eBike Crank Arms - Bosch/TQ/Avinox/Gen 4 Levo

The 5DEV R-SPEC eBike Crank Arms are precision CNC-machined aluminium cranks built for aggressive e-MTB use on Bosch, TQ, Avinox and Gen 4 Levo motor systems. Their R-SPEC low-profile design improves trail clearance to reduce pedal strikes, while 7075-T651 billet construction delivers high stiffness and long-term durability under heavy motor torque. Short crank length options further improve cadence control and ground clearance, making them a focused upgrade for modern e-MTB setups.

Key Features and Benefits:

• R-SPEC low-profile crank design for maximum strength and ground clearance: The slimmed profile around the pedal interface reduces excess material without weakening the structure. This lowers the risk of pedal strikes on technical climbs and rough terrain, helping maintain momentum and protect the crank arms from impact damage.
• CNC-machined from 7075-T651 aerospace-grade aluminium billet: Each arm is machined from a single billet for consistent material density and precise tolerances. This increases stiffness under load and improves power transfer from rider and motor, resulting in a direct and reliable pedal feel.
• Short crank lengths (155 mm / 160 mm) to reduce pedal strikes and improve cadence: Reduced arm length decreases the pedal’s arc at the bottom of the stroke. This increases ground clearance and supports smoother cadence at higher RPM, improving control on steep or technical terrain.
• Dedicated fit for Bosch, TQ, Avinox and Gen 4 Specialized Levo systems: The crank interface is engineered for these motor platforms to ensure correct spline engagement and secure fitment. This maintains drivetrain alignment and ensures consistent performance under high torque loads.
• ISIS / IS Spline drive interface: The robust spline standard provides strong engagement between crank and motor spindle. This reduces play over time and maintains long-term reliability in high-power e-MTB applications.
• Supplied with crank bolts and self-extracting hardware: Included hardware simplifies installation and removal without specialist tools. This supports routine maintenance and makes future upgrades straightforward.

Aggressive e-MTB riding demands strength, control and reliability under sustained motor torque. The R-SPEC design combines high-grade billet aluminium, precise machining and shorter crank lengths to deliver consistent power transfer and improved ground clearance. The result is a crankset that supports efficient cadence, reduced impact risk and dependable performance across demanding terrain.

For riders refining their e-MTB setup, these crank arms offer a focused upgrade in strength, clearance and control. Choose the correct length for your build and secure a durable, precision-machined solution designed to handle modern e-bike demands.