Race Face

Aeffect R ISIS E-MTB Crank Arms

What Our Gearhead® Experts Are Saying:

"I’ve installed these on multiple Bosch Gen 4 and Gen 5 E-bikes, and they’ve been impressively solid for the price. The arms feel stiff under load, hold up well to rock strikes, and the shorter lengths really help with pedal clearance. If you want a reliable alloy crank for aggressive E-bike riding without overspending, this is a great option."

When we’re climbing steep lines and muscling through technical terrain, the Race Face Aeffect R E-Bike Crank Arms keep our power feeling planted and predictable. Designed for the added torque and demands of E-bike riding, they give us the confidence to push harder on climbs and stay composed when the trail gets rough. Clean styling and proven durability make them a natural fit for modern trail and enduro E-bikes.

Forged from tough 7050-T6 aluminum, these crank arms are optimized for Bosch Gen 4 and Gen 5 drive systems, delivering efficient power transfer with a smooth, controlled pedal feel. Multiple length options help fine-tune fit while improving rock and root clearance, and the ISIS interface ensures broad compatibility across Bosch-equipped E-bike platforms.