I'm attempting to build a small self-propelled LEGO robot. Initially I was attempting to use some cheap DC hobby motors but I spent a lot of time trying to attach LEGO wheels to the motor's 3mm spindle and could never get enough torque to make the robot move.
I have now purchased two official Lego M-Motors. Unfortunately I don't have any wheels with a large enough diameter so I'm now looking around to get some matching wheels for the motors. The wheels will need to have a diameter of at least 40mm (the motor's height is 24mm).
I have had a look around but am a bit bamboozled by all the options. Has anyone use one of these motors in a robot and have any suggestions for a wheel type?