This robot is equipped with 52mm motors. The default configuration has a top speed of 377 feet per minute and a payload up to 60 lbs. With different configurations, speed can range from 115 to 746 feet per minute and payload can range from 10 to 120 lbs.
This set of wheelchair motors makes great heavy duty robot motors. One left motor and one right motor. They are right angle gear drives with a release and electric brakes. They are 24VDC and the operating speed is 120 RPM.