Help choosing correct motors and gearing

I am designing and constructing a robot similar to the one shown in the attached photo and video. I am very new to the hardware part of robotics and am looking for any information you can provide. I need to select the correct motors and gearing to be able to propell a ~100lb (45kg) vehicle and payload across ice. I can use either 2 or 4 motors. The vehicle will be running on ~18in (45cm) tires. Power is preferablly 12v but can be 24v. if needed. The desired maximum speed is 4.5 mph (2 m/s), but can be as low as 2.25 mph (1 m/s).

Thanks!

youtu.be/yvz4tXoAiJE

Hi,

A good starting point would be to look at these tutorials and dynamic tools we have available:

]Drive Motor Sizing Tutorial/:m]
]Drive Motor Sizing Tool/:m]
]Vehicle Speed, RPM, and Wheel Diameter Finder/:m]
You may also be interested in the article series How to Make a Robot. Specifically, lesson 3 (Making Sense of Actuators) may be of interest to you.

Sincerely,