The best information I found was at: http://ask.metafilter.com/81620/What-is-the-practical-difference-between-a-spinning-and-regular-stationary-exercise-bike
A spinning bike:
Vs.
A stationary bike:

"Spin bikes have a heavy, weighted flywheel that is directly mechanically linked to the pedals. This makes them like fixed-gear bikes, in that if you stop pushing on the pedals, they will tend to keep spinning due to the inertia of the flywheel. This is as opposed to regular bikes or regular exercise bikes, which have some kind of freewheel system that allows the wheel to spin freely if you stop pedaling.
There's a good deal of debate out there on fixies vs. freewheels which would apply similarly to spin bikes vs. regular exercise bikes. The biomechanics is different, it's better exercise, it's worse exercise, it's hard on your knees, it's good for your form - it depends who you ask, and these things are subjective, really. Certainly the inertia will lead to a higher pedaling cadence, which is part of the spinning experience.
Also, the shape of the bike is different - a spin bike is generally designed much more like a real road bike, and your posture on the bike will reflect that. Most exercise bikes are more upright, have wider seats, and generally are more "comfortable", at least to people who aren't used to riding a road bike. To me, they are less comfortable. Again, subjective, but different posture will focus on different muscle groups."
Now that someone has spelled out what the difference is between the two bikes, it makes alot more sense to me.
Question of the Day:
Do you prefer riding a spinning bike or a stationary bike?
Do you have a bike trainer so that you can ride at home in the winter months?


