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In Europe and Australia, the output of electric-assist bicycle motors is limited to within 250 watts, and the assist will cut off once the riding speed exceeds 25km/h. Most motor systems on the market are designed this way. Given these various standards, how should we choose a suitable ebike motor?
The primary difference between different motors lies in torque, measured in Nm. High torque output means that the motor provides more assist when starting or climbing, which is very useful. You will typically find high-torque motors on electric mountain bikes. When you are climbing a steep, loose off-road surface with a low pedaling frequency, high torque will make your ride easier. Therefore, the torque output of an electric mountain bike motor usually ranges between 60Nm and 85Nm.
On the other hand, lower torque makes electric-assist road bikes or city bikes easier to ride, with gentler acceleration, and more comfortable to use in good road conditions.
Of course, your physical fitness, weight, the type of bike, and the weight of the items you are carrying also matter. The greater the overall weight, the harder it is to start and climb, thus requiring higher torque ebike motors. For some physically fit riders, high torque might make the ride too easy. In such cases, you can lower the assist level or choose a low-torque motor for a better workout.
In road or city riding environments, motor placement is less critical. However, for electric mountain bikes, a mid-drive motor that keeps the bike's center of gravity as low and central as possible will provide better handling.
On the road, you typically do not frequently change riding positions, and the climbs are not usually steep. Therefore, a rear hub motor is an efficient choice. You also don't need to worry that the weight of the hub motor will significantly shift the center of gravity to the back. Don't forget that batteries generally weigh around 2kg, and are usually fixed or built into the down tube of the frame, which balances the weight distribution of the entire bike.
When dealing with different motor system controllers or displays, you can notice differences in size, mounting location, and functionality. The more common central controls are more like bicycle computers, displaying information such as speed, distance, assist level, and battery charge. Some minimal displays might only show basic assist levels and battery power.
Which type of display is more suitable for you? It depends on how much information you want to know while riding, such as speed, distance, or even navigation. Although you can use a cycling computer as a substitute, an integrated display of the ebike motor system will keep your handlebars cleaner and save you the cost of an unnecessary bike computer.
sales@syimotor.com
+86-512-65975022
+86-512-65963935
No.588, Liupu Road, Wuzhong District, Suzhou/215124, JiangSu Province, China
