Thanks :wink: The wheels I planned to use are twin 73x20mm banebots to give me a with of 40mm.
Like this:
http://www.technobotsonline.com/banebot ... re-30.html

But the drive system will be different from what's in the drawings... I'm still obsessed with having it track driven!
I know it was a real pain to set it up and it was not the most efficient drive system at all - but I designed a new set up which hopefully should work...the steady bearing on the gimson motors will come in handy for this!
Will post a couple of drawings tomorrow...