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DRIVE UNIT

Compact and lightweight, high-output, quick response, all for "PURE RIDE".

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DRIVE UNIT

DRIVE UNIT

We have done three things
in order to achieve the "PURE RIDE".

We sought to make it lighter, to improve quick response, and to achieve higher power.
From low speed range to high speed range, a drive unit more loyal to the rider's will than
ever before creates a totally new riding experience.

Losing 380g changes the ride.
Introducing a light weight, compact drive unit.

Making the drive unit more compact, means not simply reducing the overall weight of the machine, but also refraining from interfering with the ideal frame design.
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.

Outer size comparison (Top)

13% more compact design by volume

Hollow axle shaft and Driven gear

380g weight reduction with an aggressively lightened design

Get the power you need, when you need it.

"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.

Motor torque / RPM image

Strong Power Assist up to 120rpm

Drive mode comparison image

The excitement of + one

Updated mechanical components and control program realize a previously impossible level of maneuverability.

To offer a ride directly linked to the rider's intent, Yamaha revised both the mechanical components and the control program in pursuit of a quicker, more direct response to pedaling.
In order to reduce mechanical time lag, we reduced backlash of the ratchet mechanism by one-third. Lighter-weight designs for large moving parts, such as the axle shaft and reduction gear, also contributes to a quick response.
In EXPW mode, we more finely tuned the output characteristics of the motor so that it could retain massive power while delivering a sophisticated blend of quick response and maneuverability.

Freewheel comparison

Renewed ratchet mechanism drastically reduce backlash

Driving force characteristic

The EXPW Mode of PW-X delivers the fastest response to date

Specifications

Specifications
Drive unit Center Motor
Weight 3.1 kg
Rated power 250 W
Max. torque 80 Nm* (EXPW mode)
70 Nm (High/STD/Eco/+Eco)
Max. cadence 120 rpm* (EXPW mode)
110 rpm (High/STD/Eco/+Eco)
Max support Speed 25 km/h
Support Mode (%) 5 modes
-EXPW/320
-HIGH/280
-STD/190
-ECO/100
-+ECO/50

*Depending on battery condition and circumstances

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