5Dev

R-Spec Shimano EP8 eCranks

5Dev R-Spec Shimano EP8 eCranks bring serious performance to the world of eMTB power. Designed for riders who push their bikes—and themselves—on technical terrain, these cranks deliver precision, durability, and efficiency in one sleek package.

Built as an evolution of the original R-Spec, this version surpasses the ISO Race standard for strength and reliability. The low-profile design helps minimize pedal strikes on rocky, uneven trails, letting riders clean more climbs and maintain momentum where every millimeter counts. When the trail demands full commitment, these cranks are ready to deliver every watt with confidence.

• Optimized for Shimano EP8 – Perfect Q-factor alignment (182mm) ensures a natural, balanced pedaling feel.
• Low-profile design – Reduces pedal strikes for smoother climbing and better clearance on technical terrain.
• Race-proven durability – Exceeds ISO Race standards for strength and performance under demanding eMTB loads.
• Lightweight construction – Weighing in at just 440g for efficient power transfer without unnecessary mass.

For best performance, installation by an experienced e-bike mechanic is recommended. Tighten M6 x 1.0 bolts to 14Nm and apply blue Loctite to each bolt and end cap, checking torque after the first ride to ensure everything stays dialed.