Two of my teammates (a couple) have a Fit and they can put two 29er mountain bikes in the back. They just have a board with a fork mount, you do have to take the wheel off but it isn't that bad when you consider you don't dock your gas mileage with a rack on the back and have one more defense against thieves. They do call it their "Sissy Fit" but they love it, just joke because it is so tiny.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan