How To Make An Electric Bike For Kids (Kids eMTB) that has torque sensing mid drive and is lightweight
BIKE
The build will start with a TREK Roscoe 20" mid-fat kids bike. The goal is to have a lightweight electric bike that is torque-sensing and can augment the child's strength for riding further with less fatigue and better hill climbing.
MOTOR
A mid drive motor is a better choice for a kids electric bike due to the torque sensing ability. I do not want the bike to have a throttle. The child has to pedal in order for the bike to move forward. I don't want a PAS system either, because it's easy to ghost pedal.
There aren't many options for mid drive torque sensing motors.
Advantages of Mid Drive vs Hub Motor (with torque sensing bottom bracket)
Easier to change flat tires. (The same as without a motor)
The controller is integrated into the mid drive. Saves space and weight.
Better weight distribution.
Better for steep hills and therefore lends itself better to MTB
ub motors add rotational weight, which has a bigger impact on your bike’s handling than stationary weight like a mid-drive motor.
Disadvantages
Greater chain wear
BATTERY
Planning to use the ECHO Eforce 56V batteries. They have a small 2.5Ah one that is lightweight and compact. 56V is the "Max" voltage, and the nominal voltage is 50.4V.
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