7sp mountain bike wheel on Huffy Cranbrook?

as everything sits no it won't fit. however you can cold set the frame to the right width (130mm or 135mm usually) using bolts or even a 2x4 - this has all the info you could want: http://sheldonbrown.com/frame-spacing.html

For my Huffy cranbrook I took a piece of threaded rod and widened the rear out for a 6 speed mountain bike wheel and it worked just fine. Problem arises once you want to put the chain on because the front sprocket it just a hair wider than a mountain bike chain would fit so that would need replaced as well or filed just a hair to stop any binding.