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Bicycle specifications

PWseries S2 Drive Unit Overview

Developed with the philosophy that ?less is moreя, the PWseries S2 drive unit is significantly lighter and smaller while delivering more torque than its predecessor, the best-selling PWseries ST. With a long list of features, the PWseries S2 elevates the riding experience to another level ? making this multi-role drive unit ideally suited to everything from commuting and general daily usage to countryside trekking, weekend touring, and mountain trail riding.

Increased torque-to-weight ratio: The compact PWseries S2 drive unit maximum torque of 75Nm is over 7% higher than the PWseries ST, and weight has been cut to just 2.85 Kg ? 16% less than the previous design ? making it one of the lightest in its class. This highly desirable combination of increased output with reduced mass and a 20% decrease in volume ensures that the PWseries S2 achieves one of the highest torque-to-weight ratios in the multi-role segment ? giving strong, instant, and user-friendly performance.

Greater freedom in frame design: The smaller dimensions of the unit offer bike manufacturers even greater freedom to produce generation frame designs with features such as increased ground clearance for improved performance on technical terrain.

The 20% more compact PWseries S2 layout also makes it possible for bike manufacturers to develop idealized frame designs with shorter chain-stays that can potentially increase overall rigidity to give enhanced maneuverability and increased rear wheel traction.

From an aesthetic point of view, the reduced size of the PWseries S2 drive unit also offers Yamahaяs partner bike manufacturers the opportunity to achieve a clean and minimalist look when designing the next generation of Sport and Trail models.

Improved pedaling efficiency and feel: The PWseries S2 features a narrow bottom bracket axle length of 128mm ? 22.8mm less than the PWseries ST ? which makes possible the application of a narrow Q-factor, and therefore improved pedaling efficiency and feel can be expected. This feature, together with the Automatic Support Mode, ensures an extremely easy and enjoyable riding experience.

The ISIS bottom bracket axle interface delivers increased rigidity, making this mid-class drive unit ideally suited to the needs of e-MTB riders. Additionally, being fully compatible with a front double chainring, the compact drive unit opens up greater possibilities for bike manufacturers.

Automatic Support Mode for all-round Sports and Trail: It's no simple feat to shift gears, adjust seat height, and change ride modes at roughly the same time. The Automatic Support Mode for the PWseries S2 selects the right amount of assist based on riding conditions. Whether you're starting from a stop, accelerating, braking, riding on a level surface, or climbing a hill, you can leave ride mode changes to the system and focus on shifting and braking.

Drive Unit Specifications:

• Drive unit: Center Motor
• Weight: 2.85kg
• Rated Output: 250 W
• Max. Torque: 75 Nm
• Max. Assist Speed: 25 km/h
• Assist Mode: 4 modes
  • HIGH
  • STD
  • ECO
  • +ECO
• Automatic Support Mode

PWseries S2 Variklis

PWseries S2 variklis, sukurtas laikantis filosofijos ma?iau yra daugiau, yra gerokai lengvesnis ir ma?esnis, o jo sukimo momentas didesnis nei jo pirmtako, geriausiai parduodamo PWseries ST. Naujasis PWseries S2, turintis ilg? funkcij? s?ra??, pakelia va?iavimo patirt? ? kit? lygmen?, tod?l ?is daugiafunkci?kas variklis idealiai tinka visiems poreikiams - nuo va?iavimo ? darb? ir kasdienio naudojimo iki ?ygi? po apylinkes, savaitgalio kelioni? ir va?in?jimo kaln? takais.

Didesnis sukimo momento ir svorio santykis

Naujojo kompakti?ko PWseries S2 variklio maksimalus sukimo momentas yra 7 % didesnis nei PWseries ST, o svoris suma?intas iki 2,85 kg - 16 % ma?iau nei ankstesn?s konstrukcijos, tod?l jis yra vienas lengviausi? savo klas?je. ?is labai pageidautinas padidintos galios ir suma?intos mas?s bei 20 % suma?into t?rio derinys u?tikrina, kad naujasis PWseries S2 pasiekia vien? did?iausi? sukimo momento ir svorio santykio rodikli? daugiafunkci? varikli? segmente - u?tikrina tvirt?, momentin? ir patog? naudoti veikim?.

Didesn? r?mo projektavimo laisv?

Ma?esni naujojo bloko matmenys suteikia dvira?i? gamintojams dar didesn? laisv? kurti naujos kartos r?m? konstrukcijas, pasi?ymin?ias tokiomis savyb?mis, kaip padidinta pro?vaisa, kad b?t? galima geriau va?iuoti techni?komis vietov?mis. D?l 20 % kompakti?kesnio PWseries S2 i?d?stymo dvira?i? gamintojai taip pat gali kurti idealizuotas r?m? konstrukcijas su trumpesn?mis grandin?s atramomis, kurios potencialiai gali padidinti bendr? standum?, kad b?t? u?tikrintas geresnis manevringumas ir didesn? galinio rato trauka.

Estetiniu po?i?riu suma?intas PWseries S2 variklio dydis taip pat suteikia Yamaha partneriams dvira?i? gamintojams galimyb? sukurti ?vari? ir minimalistin? i?vaizd? kuriant naujos kartos Sport ir Trail modelius.

Geresnis pedal? mynimo efektyvumas ir poj?tis

Naujosios PWseries S2 modelio miniklio veleno ilgis 22,8 mm ma?esnis nei PWseries ST modelio, tod?l galima tik?tis didesnio efektyvumo ir geresni? poj??i? minant pedalus. ?i savyb? kartu su automatiniu palaikymo re?imu u?tikrina itin lengv? ir malon? va?iavim?. Naujoji ISIS miniklio veleno s?saja u?tikrina didesn? standum?, tod?l ?is naujas vidutin?s klas?s variklis idealiai tinka e-MTB dviratinink? poreikiams, o kadangi yra visi?kai suderinamas su priekiniu dviej? pavar? ?vaig?d?i? bloku, kompakti?kas naujasis ?vaig?d?i? blokas atveria daugiau galimybi? dvira?i? gamintojams.

Automatinis palaikymo re?imas

Vienu metu perjungti pavaras, reguliuoti s?dyn?s auk?t? ir keisti va?iavimo re?im? n?ra paprasta. PWseries S2 automatinis palaikymo re?imas parenka reikiam? pagalbos kiek? pagal va?iavimo s?lygas. Nesvarbu, ar pradedate va?iuoti i? sustojimo, ar greit?jate, ar stabdote, ar va?iuojate lygiu pavir?iumi, ar kopiate ? kaln?, va?iavimo re?imo keitim? galite palikti sistemai ir sutelkti d?mes? ? pavar? perjungim? ir stabdym?.

Specifikacijos

• Variklis: ?montuotas centre
• Svoris: 2,85 kg
• Nominali galia: 250 W
• Sukimo momentas: 75 Nm
• Maksimalus pagalbinis greitis: 25 km/val.
• Re?imai:
  • DIDEL?
  • STD
  • ECO
  • +ECO
• Automatin?s pagalbos re?imas: Taip

Frame geometry

• Seat tube length: 460 mm
• Reach: 425 mm
• Stack: 610 mm
• Top tube: 611 mm
• Steering angle: 68,5 mm
• Seat tube angle: 73 mm
• Head tube: 130 mm
• BB drop: 60 mm
• Wheelbase: 1160 mm
• Chain stay: 475 mm
• Crank length: 114 mm
• Stem length: 40 mm
• Handlebar width: 680 mm
• Seatpost length: 350 mm
• Ground clearance: 200 mm
• Standover: 775 mm