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Electric Bikes

Winora Radius Plain

  • Frame type


  • In Stock for Next Day Delivery

  • Yamaha PW 250W centre motor

  • Yamaha battery, 36V, 400Wh, lithium ion

  • Sram iMotion 3-speed hub gear

  • The 90 ° rotatable TwistComp handlebar stem unit

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Eurobike award Judges’ statement: "This compact e-bike is good fun. It’s a zippy little vehicle to get around on, but requires little space to park, making it ideal for urban dwellers. Further bonuses include clever details, such as foldable components and a well-placed handle to carry it with.”

Weighing in at under 20kg, the Radius is our lightest e-bike. It's also 52% more compact that a full sized e-Bike that makes it ideal for the urban user looking for a highly transportable, stowable, powerful commuting electric bike. 

Equipped with one of the best e-bike systems on the market the Yamaha PW mid-engine Drive Unit is proven to be a powerful, light and reliable motor. Thanks to its Zero-Cadence system, it supports the rider from the first revolution of the crank. It's compact size, this middle mounted system, where the power unit and the battery are mounted close to the pedals, creating a low and central gravity point. 

The end result is an outstanding weight / balance ratio and excellent riding stability.

 The PW unit by Yamaha has an eceptionaly quick power delivery and ample amounts of low-down torque – up to 70nm in High Mode – making electrical assist on hills and gravel roads – under the harshest of conditions– extremely powerful. 

The level of assistance reaches an impressive level of 280% at maximum output!


The LCD multi function Drive Controller is designed to be Clear and informative.

The newly adopted vertical display makes information such as remaining assist distance highly visible. Attachment is also ergonomically designed, with the display on the center of the handle bars and switches adjacent to the hands. The display can be controlled without taking your hands off the handle bars, resulting in a safer rode, and smoother control of the switch.
Drive control: 4 selectable assist modesBattery capacity indicator: 10 scale bar Digital display (in %)Assist power meter

Cycle computer
Range meter
Cadence meter
Removable display
USB connector is added:5V electric power can be supplied to connected device.
A new mode of assistance has been added to the exisiting three (Eco, Medium and High). The new mode, called Eco , is more conservative and will extend the range up to 30% ! A great addition considering the amount of power that was already on the Eco mode.


Set off, and enjoy a new freedom of urban mobility with the new compact electric bike from Winora. Everyday city riding and also extensive tours of the countryside are possible with this adventurous little bike. For maximum comfort and riding pleasure, high-quality components from renowned manufacturers have been used through out.

This well constructed e-bike has many clever hidden details to help the urban rider in it's use and storage. Quickly twistable handlebars and the pedals be fold away, which is very space-saving in small apartments or garages. Thanks to the integrated built-in carrying function a central grip on the top tube, the Radius can also easily be carried to highest levels in a block of flats.

Winora RADIUS has the dynamic propulsion the Yamaha PW Motor, in combination with a 400 Wh Lithium battery to cover the whole metropolitan radius area of a City.
Not only does it have good grip and cushioning from the Schwalbe Big Ben 20 inch balloon tyres but there is also an ingenious minimalist chain-guard to keep your city slickers clean. Another detail is the use of a Strengtex saddle from Selle Royal. This is made from a particularly robust material which makes the saddle resistant to the harshest external conditions. 
IMotion Sram 3 speed internal gearing system, Tektro hydraulic disc brakes, and equipped with special chain guard, etc., the Winora Radius Urban possesses everything to satisfy the everyday urban commuter!

    •    Yamaha PW mid-engine with 250 Watt
    •    Yamaha battery, 36V, 400Wh, lithium ion
    •    Uncluttered multifunction Yamaha LCD display and push assistance
    •    Sram iMotion 3-speed hub gear



Ratings and Reviews

Easy to store but similar ride characteristics to a standard bike

by from UK on

Small wheelers are also becoming more popular. These are compact bikes that use a 20” wheel as opposed to a more standard 26” or 29” wheel. The upside is that they’re significantly smaller, which makes storing them easier; they have a similar ride position and ride characteristics to a standard bike. Frames usually have a fairly low stepover height, though not as low as a standard step-through.

Winora Radius – when you want to go lightly

by from UK on

This isn’t just light (models start at less than 20kg), it’s also easy to store. It doesn’t fold, but you can tuck away the pedals and handlebars making it possible to put in a larger locker or under a bed/seat. Frame size is 35cm and that triangular section in the frame is designed to act as a handle. Those chunky tyres help compensate for the lack of suspension. The rear hub gears and protected chain promise easy maintenance. It’s motor can take you up to 170km (105 miles) when riding in its most economical mode. This model weighs 16.7kg.

Technical Specifications

Frame shape Compact
Frame Aluminium 6061, hydroformed
Motor Yamaha PW, 36 V, 400 Wh
Battery Lithium Ion, 36 V, 400 Wh
Display Yamaha LCD
Fork Aluminium 6061
Gear Sram iMotion, 3-gear
Crank Winora Alu
Chain KMC X1
Rims Rodi FW-Disc
Tires Schwalbe Big Ben
Saddle Royal Arco
Seatpost Alu links
Handle Bar Endorphins XLC
Stem Speedlifter twist pro
Brake Tektro Auriga disc brake
Pedals F80 Faltpedal
Lighting Spanninga kendo; B & M Xeltec
Kick Stand Aluminum side stand, rear

Weight battery 2,95 kg
Weight charger 950 g
Weight 25kg
Available colours black

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Finance Options Available

All our new bikes are available to buy with interest-free finance (typical 0% APR). You can ease the cost of ownership by paying a deposit and choosing one of our finance packages when checking out.

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Sometimes it takes a test ride to understand what an e-bike can do for you. Please visit one of our showrooms or take a test ride with a local Kalkhoff owner who's also a demonstrator

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