Yes, I'm finding a bike helpful as well. I've been using the NuStep (I think that is the right name). It looks like a recumbent exercise bike but the pedals and movable handle bars look like those on an Elliptical. I recently began having symptoms of neuropathy on the right inner leg. After having an EMG it turned out to be from a inflamed nerve at the root of a L5. The biking helps. I use it at my health club – it would be too expensive to buy for home use.
It works better for me than the traditional recumbent exercise bike – I don't get as winded from heart problems – not sure what difference it makes. Exercise bikes are also great for Parkinson's patients. There is a special program offered by YMCAs throughout the country called Pedaling for Parkinson's. It is group exercise for PD patients on the stationary bikes.