I managed to change foot o to mtbo using the automatic change thing in ocad12. It wasn't perfect but made it a lot more rideable.
I didn't realise there was an automatic change thing. Plus I don't appear to have the OCAD map or a printer. I don't know who drew this map. There isn't even a scale on it.
It's a new feature, worked pretty well. I only had a trial version though :(