Ahhh right, I think I understand now. Sorry I mis-read your first post. I thought you meant that you wanted to build a robot that used tank tracks.

Do you mean you want to use a chain and sprocket drive train? But you arent sure how to setup the drive train to transfer the energy from the motor to the wheel?

O and I realise that you dont like to use grammer and punctuation but it does make posts far easier to understand and it only takes an extra 2 minutes.