How large outrunner do i need ?

[speedy]

Hi !

I'd like to build a 6wheel robot that can carry about 100kg ? I going to have 6 wheels and one motor turning eath one ! for power 12s lipo or 14s li-fe packs. For esc's i w as thinkong thar 6x turnegy 100Amp 12s units would be good :)

For steering i'l use l/r side motors.

But my question is how large motors are needed (outrunners) direkt drive !