How fast can a 400W motor run?

[MaryMarie]

A 400W motor paired with a 48V 350W controller has a maximum speed of only 25km/h. Additional information: If paired with a 60V battery and a (600W) 9-tube controller, the maximum speed can reach 32km/h. If upgraded to an 800W controller, the top speed can reach 35-38km/h. Here is related information: 1. For a 600W motor: Paired with a 60V battery and a 9-tube controller, the maximum speed can reach 35-38km/h. If upgraded to a 72V battery and a 12-tube controller with an output power of 800W, the maximum speed can reach 42-45km/h. 2. For an 800W motor: Paired with a 60V battery and a 9-tube controller, the maximum speed can reach 45km/h. If upgraded to a 72V battery and a 12-tube controller with an output power of 1000W, the maximum speed can reach 51km/h. With a further current increase to 33A and a peak power of 1500W, the fastest speed can reach 60km/h.