Riding in a single gear can be somewhat tiring, especially for young people, while many appreciate the maneuverability of single-speed bicycles. Such an e-bike can also be useful for older people to stay fit and exercise.
The singlespeed e-bike with electric drive offers many advantages. It's an ideal bicycle, especially in urban areas with flat terrain. Since there are no gears on a singlespeed e-bike, its weight is reduced compared to e-bikes with a mid-drive motor. Besides the associated practical advantages, this bike offers something else: style. Singlespeed bikes look very clean and minimalist, and they really stand out in the urban jungle. Often, many details are omitted to achieve an even cleaner appearance.
Electric racing bikes are called S-Pedelecs. The "S" stands for speed, and the abbreviation speaks for itself. With motors that deliver up to 500 watts of power, a singlespeed S-Pedelec can reach speeds of up to 45 km/h in the city. A singlespeed e-bike should not be loaded with a child seat, a child bike trailer, or a luggage trailer, as the risk of an accident is too high at such speeds. You must also be over 16 years old, have at least a moped license, and insurance with an insurance sticker for S-Pedelecs. You must also wear a suitable helmet.
City bikes, lightweight e-bikes, and S-Pedelecs are particularly well-suited for urban environments. All single-speed bikes with pedelec drive systems primarily benefit from a rear hub motor (sometimes also called a "rear motor"). Lighter frames can be used in their construction compared to e-bikes with mid-drive motors. Furthermore, manufacturers have more freedom in terms of design.
Riders of single-speed bikes with rear-drive motors appreciate the following advantages over mid-drive motors:
- Immediate response when accelerating
- Smoother acceleration and traction dynamics
- Built-in mechanical freewheel
- Some motors do not require an internal gear ratio.
- Hub motors are considered extremely durable and resistant to mechanical damage.
- Neither the gearbox nor the gear ratio generates resistance, therefore the machine efficiency is very high.
Since the chain and sprockets are separate from the motor drive, component wear is considered significantly lower than with a central motor. Besides allowing for a sportier riding style, a rear-wheel drive motor also enables a more classic approach to frame design. This makes it easy to integrate an e-singlespeed drivetrain into the overall concept of a bike.
Therefore, rear-wheel drive e-bikes will be attractive to new e-bike target groups who appreciate a lighter, more aesthetically pleasing, and smaller design. They will hardly notice the electric drive motor, which is hidden between the brake disc and gears.
Technically, these motors are so-called "brushless DC motors" for pedelec bikes, primarily designed as 250W geared motors. Unlike an internal combustion engine, an electric motor does not have a "maximum power output." Theoretically, the motor can generate any amount of energy. Therefore, the displayed motor outputs, such as "250 watts," on some e-single-speed motors are the nominal outputs—the power the drive can achieve under normal operating conditions. The maximum power output of the electric motor is also determined by the battery and the controller.
One minor disadvantage of the e-single-speed hub motor: The center of gravity of the bicycle is slightly higher at the hub than at the lower position of the mid-motor.