The right tire pressure guarantees low rolling resistance and also better response between the torque sensor and the motor, and has a significant impact on preventing punctures.
Depending on your body weight and desire for comfort, you can vary somewhat, but too low tire pressure can cause the motor assistance to stop or the ride to feel much more sluggish – and the risk of punctures due to so-called “snakebites” is considerably increased.
In general, the indication on the sidewall of the tire is the maximum value, and you can still go down a little with the tire pressure, but never beyond.
Example of tire pressure indication on the sidewall, please check the right value on your tires: