Introductory Knowledge: What to Consider Before Purchasing an Electric Bicycle

The easier electric auxiliary power assist allows more people to enjoy the fun of cycling for commuting, leisure, and exercise. Health and environmentally friendly electric assist bicycles are becoming people's first choice for travel. What should we know before truly deciding to buy an electric assist bicycle? How do we choose the right ebike motor system for our ride? Here's a little knowledge about electric assist that will Shengyi share with you.

Types of Ebike Motors

Common ebike motors are divided into mid-drive motors and hub motors.

In electric assist mountain bikes, a lower center of gravity with a mid-drive motor layout is often used, achieving a centered and reasonable weight distribution without affecting the vehicle's balance at high speeds for good handling. In addition, the assistance power of the mid-drive motor acts directly on the bottom bracket, often using a clutch transmission gear internally. It can automatically disconnect the motor from the transmission system when not pedaling or when the battery is dead, thus not causing extra resistance.

For city commuter bikes, that do not require much manipulation of the bicycle, the road conditions are not as complicated as in the mountains and the need for climbing is not as great. Therefore, a rear hub motor system like DGW10Ris equally effective.

In addition, the advantage of hub motors is that they do not change the original frame bottom bracket structure, so there is no need for dedicated frame molding, making them highly compatible with traditional frames. The power acts directly on the wheel, effectively reducing transmission wear. Furthermore, micro hub motors can achieve an appearance almost identical to that of native bicycles, which is one of the important factors why international brands choose hub motor systems for electric assist road bikes.

The Torque of Ebike Motors 

For riding environments, electric assist mountain bikes require motors to have higher torque output, usually utilizing torque sensors to accurately detect pedal torque, thereby understanding the cyclist's intention. This allows for easier climbing on steep and complex off-road paths even at low pedal frequencies.

Therefore, the torque output of electric assist mountain bike motors is usually between 60Nm and 85Nm. The CMT09 drive system has 750W rated power and up to 160Nm torque output, providing strong power throughout mountain rides.

Electric assist systems designed for road bikes focus more on the smooth cadence and gradual motor assist performance. Therefore, the tuning of the power is different. High-speed cruising does not require too much power intervention, so the motor torque output is generally not too large. The Shengyi CMT07 mid-drive electric assist system, specially developed for road bikes, has a motor weighing only 3.3 kg but can output a rated power of 250W and a maximum torque of up to 85 N.m.

If you want to go on a spontaneous trip with an electric assist bike, the higher the total weight when fully loaded with equipment, the more difficult it is to maintain continuous power output while climbing, thus the greater the need for torque.

However, it is not always true that the greater the torque, the better. Excessive torque output will reduce the effort needed for human pedaling and make it harder to control on bumpy roads. When the ebike motor consistently provides 300% assistive power, the overly easy ride can make it feel boring.

Related Electric Motor Products

DGW25R Ebike Brushless Motor Wheel

DGW07C-RA-Rear Drive Motor-city bike

Electric Scooter Motor

DGW11-Front Drive Motor