We’ve got two wheels now, baby! (and I’ve refined this a bit from a bungee only setup).  Here’s my rig for bicycling for Mapillary photos.  This uses the same gimbal for stabilizing and leveling the photos, so it should have similarly great output.

Mapillary output yet to come for this one.  In the mean time, you can watch the camera gimbal come alive:

Also you can look at the stabilized unicycle versions here: https://mapillary.github.io/mapillary_examples/seven_hills.html and here: http://www.mapillary.com/map/im/16/41.38742655884223/-81.69359564781189