Pedal assist system includes the normal imitation torque sensor and real torque sensor. The former one occupies about 90% market, because of the high cost-effective. The imitation torque sensors are divided into need remove the bike bottom bracket model and no need remove the bike bottom bracket model. You can choose 5 magnets, 8 magnets, 10 magnets, 12 magnets. More magnets means more sensitive.
