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What’s the Best Motor for an E-Bike?

24 July, 2025

When it comes to choosing an e-bike, the motor—along with the battery capacity—is one of the most important factors influencing the purchase decision.

Bosch, Shimano, Askoll… the question is always the same: which one is the best?

In this video, Alex Boyce—English journalist, experienced e-bike tester for Moto.it—and Stefano Migliorini -CEO of THOK E-Bikes- provide clear answers once and for all. They compare technologies, real riding sensations, and performance.

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THE TRUTH?
There’s no absolute “best” motor—only the one that’s best suited to your riding style, favorite trails, and personal needs.

THOK E-MTB SPECIALISTS: 3 MOTORS, CAREFULLY SELECTED

THOK’s range features three different motor systems: Shimano, Bosch, and Askoll.
Each has been selected by our R&D team based on the technical specs of the bikes, their intended use, and the type of rider.
Here’s a quick comparison to help guide your choice.

SHIMANO EP801 / EP6

⚡️ Torque: 85 Nm (peak power 600 W)
⚖️ Weight: EP801 – 2.7 kg (among the lightest in its category) / EP6 – 2.9 kg
📲 Apps: SHIMANO E-TUBE PROJECT CYCLIST
💢 Highlights: Smooth and natural support, wide cadence range, Di2 and Auto Shift compatibility

👍 THOK team’s view: A light and fluid motor, ideal for riders coming from the traditional MTB world, used to high pedaling cadence and those who prefer subtle, progressive assistance.

🚵🏼 THOK Models: EP801 – Dream Kit Shimano / EP6 – TK01, MIG

BOSCH CX BDU384Y

⚡️ Torque: 100 Nm
💪 Power: 250 W (up to 750 W with firmware upgrade)
⚖️ Weight: approx. 2.8 kg
📲 Apps: BOSCH EBIKE FLOW
💢 Highlights: Powerful yet controlled response, innovative sensors, quiet operation, ABS Pro compatibility

👍 THOK team’s view: A reliable, high-performance motor offering linear power delivery and intuitive handling—even for less experienced riders.

🚵🏻‍♀️ THOK Models: TP4, TP4-S, TP4-R, TP4 Ltd

ASKOLL Ultra C90A

⚡️ Torque: 90 Nm (110 Nm in Boost mode), up to 1,200 W peak power
⚖️ Weight: 2.9 kg
📲 Apps: SIGMA
💢 Highlights: 100% Made in Italy, explosive torque, 5 assistance levels

👍 THOK team’s view: A high-torque, ultra-responsive motor. Ideal for riders with a background in motocross or those who race in e-MTB competitions.

🚵🏻‍♀️ THOK Models: GRAM – Dream Kit Askoll