What is the maximum speed of a 400W motor?

[MirandaLee]

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