Bicycles

All four limbs power the 2WD TwiCycle

All four limbs power the 2WD T...
The TwiCycle has a chain running directly from the revolving handlebars to a derailleur and cassette mounted on the front wheel
The TwiCycle has a chain running directly from the revolving handlebars to a derailleur and cassette mounted on the front wheel
View 6 Images
A chest pad protects TwiCycle riders from the front chainring
1/6
A chest pad protects TwiCycle riders from the front chainring
The two-wheel-drive TwiCycle
2/6
The two-wheel-drive TwiCycle
There are plans for a mountain bike version of the TwiCycle
3/6
There are plans for a mountain bike version of the TwiCycle
TwiCycle inventor Boyan Rista plans on launching a crowdfunding campaign soon
4/6
TwiCycle inventor Boyan Rista plans on launching a crowdfunding campaign soon
The TwiCycle has a chain running directly from the revolving handlebars to a derailleur and cassette mounted on the front wheel
5/6
The TwiCycle has a chain running directly from the revolving handlebars to a derailleur and cassette mounted on the front wheel
A closer view of the front derailleur and cassette
6/6
A closer view of the front derailleur and cassette
View gallery - 6 images

Remember the Varibike? It's a bicycle that can be pedalled with both the arms and the legs, allowing for more of a full-body workout. Well, if an upcoming crowdfunding campaign is successful, it'll soon have some competition … in the form of the TwiCycle.

As with the Varibike, TwiCycle riders can pedal with just their arms, just their legs, or with both at once – the arm-cranks can be locked in a horizontal position to form a regular(ish) handlebar when not needed.

There is at least one key difference, however.

On the Varibike, a chain running from the arm-cranks down to the crankset ultimately delivers the rider's arm power to the rear wheel. By contrast, the TwiCycle has a chain running directly from the bars to a derailleur and cassette mounted on the front wheel. This gives the bike two-wheel-drive, allowing for added traction when both arms and legs are used – and yes, there are plans for a mountain bike version.

A chest pad protects TwiCycle riders from the front chainring
A chest pad protects TwiCycle riders from the front chainring

The front-drive arrangement does place a bar-mounted chainring near the rider's face, although a stem-mounted chest pad (not pictured in all the photos, but seen above) should keep them from accidentally making contact with it.

Inventor Boyan Rista plans on launching a crowdfunding campaign this summer (Northern Hemisphere), and tells us that he hopes the TwiCycle will be priced "very similarly to normal road bikes of similar performance characteristics." In the meantime, check out the prototype in the video below.

Source: TwiCycle

Twicycle- Cycle With Your Arms, Legs or Both, teaser trailer

View gallery - 6 images
4 comments
4 comments
Bob Stuart
The way to do this is with rocking handlebars, with a connecting rod to a crank. That way, you are not wasting your back muscles, and it can, to some extent, work in opposition to the leg muscles. Done perfectly, this can get you 15% more power in a sprint, and about 1% more aerobically.
wle
yes i want a dirty chain to get caught in, and sharp chain ring right in my nose while i am bobbing up and down trying to arm-pedal, shift, brake, and steer a bike that is heavier and slower than a real one, for how much money?
oh wait, silly me, i forgot, maybe i don't.
wle
wle
how many times are people going to re-invent 4 limbed cycling?
do none of them realize that adding muscles does not add more power?
the heart has a limit, and the legs alone can use it all.
yes in a sprint you might add 150 watts for a minute, but that better be at the end of the race - if you do that, your aerobic performance is destroyed for that day.
wle
habakak
What a ridiculous contraption. Not for any half-serious cyclists. How do you safely steer with this thing? This is at best a device for stationary cycling.