I've always wondered what a dual drive setup would be like to ride ? That is a left hand & right hand side same gear inches/ratio on both sides while pedaling. Something like this only both sides freewheel or even both sides fixed ?

http://www.youtube.com/watch?v=T-IjXMQmodw

This was a similar concept ?

http://www.bikeforums.net/showthread...le-drive-fixed