Having looked at more spec sheets than I care to, there seems to be distinct lack of mention of the motor's torque constant. Everything seems to be focused on speed, i.e. voltage constant as in RPM/Volt. But without the required torque to accelerate the maximum speed is largely theoretical. Coming from the industrial world of electrical motors, the imporant specs are torque constant, maximum current, maximum power dissipation in ambient condition, and voltage constant.
Why is this? Is it that allows some of the chinese companies to inflate their specs?