Yamaha PW-X Motor

Yamaha thoroughly lightened the design by 380g by adopting a hollow axle shaft, using a thinner driven gear, and reducing the case thickness, while simultaneously reducing volume by nearly 13%. We also adopted the 128mm ISIS interface BB Axle commonly used in MTB in response to expectations for a more authentic ride.

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"Truly powerful" as Yamaha sees it means ability to deliver the power the rider wants quickly and dependably.
PW-X inherited Yamaha’s well-established power and control technology, while adding a fifth mode; Extra Power Mode.
With EXPW mode, the unit better harnesses the motor’s power thanks to the drastically improved cooling effects. It not only improves assist torque in all ranges; compared with conventional models, it also better maintains assistance up to high rpm. In addition, it offers robust support to riders recovering from tight turns or climbing challenging steep slopes.

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