There few if any photos showing the Helix from the right, folded or not. But the rear wheel sits next to the seat tube exactly where a FD would be mounted. With a bigger chainwheel it might be possible, hard to say, but cranksets are also limited. Not sure exactly why, but the position of the rear wheel when folded is the reason. Also, chainring size is constrained by chainstay clearance.
Last edited by jur; 10-18-15 at 04:01 PM.