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DRIVE UNIT

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

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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.

Dropping 380g changes the ride.
A light weight, compact drive unit.

To make the drive unit more compact, means not simply reducing the overall weight of the machine, but not inhibiting the ideal frame design.
Yamaha thoroughly lightened the weight down to 380g by making the axle shaft hollow, thinning the driven gear, and thinning the case, while simultaneously reducing volume by nearly 13%. We also adopted a 128mm ISIS interface BB Axle commonly used in MTB, responding to expectations for a more authentic ride.

13% volume compact design

Achieved -380g with a thoroughly
lightened design

Supplies the desired power when needed.

"Truly powerful" as Yamaha sees it is the ability to deliver the power the rider wants quickly and dependably.
PW-X inherited its well established power and control technology, while also adopting a fifth mode; Extra Power Mode.
With EXPW mode, it succeeds in further releasing power originally held by the motor, via the drastically improved cooling effect. It not only improves assist torque in all ranges; compared with conventional models, it better maintains assistance up to high rpm. It also offers strong support to riders recovering from tight turns or climbing challenging steep slopes.

Strong Power Assist up to 120rpm

The excitement of + one

Updated mechanical components and
control program realize previously unexperienced
"Best Maneuverability".

To offer a ride directly linked to the rider's intent, Yamaha revised both the mechanical components and control program, in the pursuit of quicker, more direct response to pedaling.
In order to reduce mechanical time lag, we reduced backlash of the ratchet mechanism by 1/3. Lightening 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. This keeps massive power while balancing quick response and maneuverability at a high level.

Renewed ratchet mechanism
drastically reduce backlash

The EXPW Mode of PW-X realizes
the fastest response so far

Specifications

Specifications
Drive unit type 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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