<!-- Before we can help you, we need some information about what you are trying to do and what software you are using. Please fill out the information below. - *ev3dev-python3 I like to use for my Lego Robot : Move Differential (class ev3dev2.motor.MoveDifferential(...) The Robot has two wheels (diameter 81.6 mm and a wheel _distance 120 mm) Not clear for me is how to how to implement my wheels in the following lines:: from ev3dev2.wheel import ???????? STUD_MM=8 mdiff= MoveDifferential(OUTPUT _B, OUPUT_C, ???????, 15 x STUD_MM) kind regards Monsfortis1930