Recumbent bikes can be expensive. For those of you with the do-it-yourself approach, check out how this guy did it.

The creators of the Hydrobike claim that their water bike is the fastest and most efficient in the world.
The pedals power a propeller that can bring a rider to cruising speeds of 4-6 mph, and a top speed of 10 mph.
It’s quiet, stable, and can be used on most bodies of water.
The Hydrobike can be [...]

Check out this electric creation called the LA Skatebike. It has handlebars, brakes, and a front wheel like a bike, but in place of the seat, pedals, and back wheel is a skateboard. It’s like a scooter, but it has a touch of skateboard added to the mix.
The LA Skatebike has a 250 [...]

Check out this bike called the SpinCycle. 

This is one bike you wouldn’t want to fall off of… not that any sane person would want to fall of any kind of bike, but anyway…
this bike is 10 feet tall.

Monowheel cycles are something different.  With your basic bicycle, riders get “on” and ride, but with a monowheel, the rider gets “in,”  and sits inside of one giant wheel.
While monowheel cycles are definitely something to look at, their is much to be improved in the monowheel world. In the cycle contest, the bicycle still wins over the [...]

You could bike around on just an average bike… or you could be different and do something like below. Here are a few bikes that people got creative with.  They welded roll bars on so they could do a somersault on their bike, and then keep riding.
Here’s a pocketbike that has a roll bar attached [...]