I didn't know chainless bicycles existed, but apparently they have been around for a loooong time. They are also called "shaft-driven bicycles" because instead of using a chain, they use a drive shaft.
I hate it when the chain pops off a bike, and it's also annoying when a pant leg gets caught in the gears. I have completely ripped a pant leg in half doing that.
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There is something called the NuVinci CVT, which can be used on bikes to provide an UNLIMITED number of gears. That's pretty amazing.
The NuVinci CVT (Continuously Variable planetary Transmission) system contains balls on the inside that, well... just watch the video, I don't think I'd be able to explain it.
When it's equipped on a bike to change the transmission you have to twist the handlebar to increase/decrease the drive.
This thing can be used on more than just bikes too. It can also be used on...
Link: Fallbrook Technologies
Recumbent bikes can be expensive. For those of you with the do-it-yourself approach, check out how this guy did it. He made a cheap recumbent bike out of a woman's bike and part of a kid's bike. He made it without having to weld anything or drill any holes.
See more details on how he did it here.
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 ActionBent Toscana USS Recumbent BicycleHot New Bike  US $899.00
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 NEW Recumbent Bike Bicycle Safety Flag NEW US $22.50
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 EZ 1 super cruiser recumbent bike US $450.00
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 Recumbent Trike 70 CM bicycle 2010 Brad NEW bike US $1,099.00
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The HumanCar is a human powered vehicle that is propelled without the use of pedals. It seats up to four riders that can all work together to move, and even steer, the HumanCar.
To propel the HumanCar, riders use their upper body strength to pull the bars (like you would a rowboat). To steer the riders lean left or right in the direction they want to steer.
The HumanCar was designed to be street legal, and can achieve speeds of up to 30+ mph. Downhill it has gone at speeds of over 60 mph.
Link: HumanCar
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ActionBent Toscana USS Recumbent BicycleHot New Bike US $899.00
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EZ 1 super cruiser recumbent bike US $450.00
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 Recumbent Trike JC 70 2010 Brand NEW US $1,199.00
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Recumbent Trike 70 CM bicycle 2010 Brad NEW bike US $1,099.00
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Check out this bike called the SpinCycle.
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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 monowheel.
Video of a Monowheel in Action
I've never seen a tandem bicycle that has the riders back to back. Kind of plays a trick on the mind. Are they coming or going?
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 cannondale tandem great bikeloaded US $2,500.00
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 Beach Cruiser bike Shimano 18 Speed TANDEM BIKE Island US $339.99
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 MONGOOSE 26 Wanderer AL Tandem R5006 Bike Bycicle US $399.00
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 09 PACIFIC 26 Dualie Tandem 21 Speed Road Bike Bycicle US $319.00
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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 to it....
Here's a bike that has two roll bars on it to make rolling easier...
Last, but not least, here's a bike that rolls over... a lot...
Meet the Bike-Yak. It's a combination of a Kayak and a Bike, and it's made entirely from parts saved from a landfill. If global warming causes a 10 foot increase in sea level, serious flooding would occur in low lying areas.
The Bike-Yak could be one possible mode of transportation for areas that may become flooded due to global warming.
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Check out this awesome Max Skate Bike commercial from 1989.
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 Magic Wheel One Wheel Skate Board Scooter Unicycle Bike US $74.95
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The SQRL (called "Squirrel") Skatebike is basically like a unicycle, except it has two wheels added to the front. The Skatebike has a grab bar in the front to help with balance and steering. To steer the Skatebike, just lean to either side.
Video of the SQRL Skatebike in Action
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Magic Wheel One Wheel Skate Board Scooter Unicycle Bike US $74.95
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