September 5, 2022 - Developed on the principle that “less is more”, the PWseries S2 drive unit is much lighter and more powerful than the hugely popular PWseries ST launched in 2018. Designed to meet the needs of European e-bike manufacturers, this new system offers a natural and pleasant pedaling experience.

Improved torque-to-weight ratio
Yamaha engineers have worked tirelessly to make the PWseries S2 one of the most powerful and lightest drive units in its class. Producing an instantaneous torque of 75 Nm for a weight of only 2.85 kg, it has a torque/weight ratio that places it among the best in its category. 

Building on the proven strengths of the PWseries ST, the new PWseries S2 takes the pedaling experience to the next level and makes this versatile training unit an ideal solution for any type of use: daily commuting, hiking countryside, excursions and mountain bike outings at the weekend.

Compact dimensions
Lighter and more powerful than the PWseries ST, the PWseries S2 is also much more compact. Its overall dimensions are comparable to the flagship PWseries X3 model, giving Yamaha’s partner bike builders even more freedom to develop the next generation of chassis.

The new PWseries S2 drive unit is complemented by the new Display B, a user interface designed to provide accessible information and ease operation. This simple, durable and reliable system is aimed at the recreational cyclist market who appreciate a “ready to ride” design requiring minimal commissioning.

Yamaha Exclusive Electronic Control Technologies
With a wealth of experience in the design and manufacture of e-bike systems (E-Bikes), combined with motorsports know-how dating back to 1955, the Yamaha brand is recognized as one of the most innovative in terms of of electronic control technology. Benefiting from the automatic assistance mode and Zero Cadence technology, the PWseries S2 provides each user with an easy, pleasant and intuitive experience on the handlebars of an electric bike.

Improved pedaling efficiency and feel
The PWseries S2 features a 22.8mm shorter bottom bracket compared to the PWseries ST, which improves efficiency and feel and provides extremely easy and enjoyable pedaling. The new ISIS bottom bracket interface provides increased rigidity. Fully compatible with a double front chainring, this new compact drive unit opens up new possibilities for bike manufacturers.

European production to allow Yamaha to reach its carbon neutral goal faster
In order to accelerate Yamaha’s goal of carbon neutrality by 2050, Yamaha drive units will be produced in the MBK Industrie factory, 100% owned by the brand and located in France.

Relocating production of the PWseries drive units from Japan to Western Europe not only contributes to Yamaha’s goal of carbon neutrality, but also reduces the cost of transport and reduces logistics times. It offers many other advantages to bicycle manufacturers: significantly reduced lead times, greater flexibility in deliveries, elimination of external disruptions in the supply chain (such as port congestion), optimized packaging for logistics within continental EU and waste reduction.

The MBK Industrie factory in Saint-Quentin (02) currently manufactures more than 80,000 Yamaha motorcycles, scooters and leisure vehicles each year. Holder of ISO 14001 certifications, for environmental protection, and ISO 9001, for quality improvement, MBK Industrie is able to offer the highest levels of service to its European customers.

Highlights of the PWseries S2

• New, class-leading, high-capacity drive unit with multiple applications
• Lighter, smaller and more powerful than the best-selling PWseries ST in its class 
• Smooth and natural acceleration
• Maximum torque increased by 75 Nm*
• Higher torque-to-weight ratio*
• Reduced weight of only 2.85 kg, which is 0.5 kg (16%) less than the PWseries ST
• Exceptional torque-to-weight ratio 
• Universal applications for Sport and Trail use
• Ultra-compact dimensions that provide greater freedom in chassis design
• New ISIS bottom bracket interface
• 22.8 mm shorter crankset for comfortable and efficient pedaling
• Yamaha Zero Cadence technology for instant assistance
• Automatic assistance mode for simple and intuitive e-bike riding
• Yamaha quality and reliability
• Reliable and maintenance-free design
• *PWseries S2 compared to PWseries ST

SPECIFICATIONS

• Rated voltage : 36V
• Rated output : 250W
• Weight : 2.85kg
• Max. assist speed : 25 km/h
• Max. drive torque : 75 Nm
• Support mode (5 modes) : HIGH, STD, ECO, +ECO and OFF

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