The Gikma comes equipped with dishless, symmetrically laced tandem rear wheel with a 145mm axle. The left side of the axle is thredded so that one can fit a freewheel on it.
While I have never had to do this (knock-on-wood), it is comforting to know that this option is available. While I was at REI today, I did look at a Shimano freewheel which was a potential candidate for this purpose. It looked like the one in the picture below.
Image above courtesy of Amazon.com
Folks, this is uncharted waters for me. I am hoping y'all will post enough comments that even I can figure this thing out in complete detail! I will conclude this post, on that note!
PS. As evident from the pictures of Gikma's axle, I guess there is still some dust on the bike gotten from the infamous Ramble :)