The Side by Side bicycle, also known as a "sociable", or more recently as a buddy bike, appears to date back to 1896. Unlike a tandem, where the riders are inline to one another, here the riders are side by side. To build one, you start with a regular bike and make 3 modifications: pedals, seats, and handle bars. To accomodate riders of different weight, my idea was to to slide the seats left/right such that the heavier rider sits closer to the frame. This adjustment is limited however since the farther the seats are extended in either direction, the more uncomfortable the pedaling becomes. Perhaps you will not need this feature. To reduce interference between the riders, the seats can be staggered as described and illustrated in this patent issued in 1979. This reference notes the use of a chain for the steering mechanism but I believe it's easier to build a linkage tie rod. Riding side by side is so much fun and exciting! The Side by Side is safer than my "Antique Bicycle", although it too requires skill which is quickly attained through practice and teamwork as demonstrated in my Side by Side video...
Step 1: Bill of Materials
Here's what you will need to build the sociable bicycle:
- A bicycle
- A welder
- Extra set of bike pedals/cranks
- Extra bike seat
- Tubing
- 2 heim joints to make a steering tie rod
Step 2: Pedals
When pushing off, each rider will have their foot resting on the pedal closest to the frame in the bottom most position (left side rider - right foot, right side rider - left foot). So cut off the left side crank and weld it back on so as to form a U. Now remove each pedal and in its place, weld a 6" long by 3/4" wide steel rod. I initially had welded a 1/2" rod to the original bolt from the pedal but was not strong enough as it twisted some while pedaling. You then make a custom pedal that will fit the 3/4" rod.
Simply use 5" of tubing that will slip over the rod and weld two 3/8" bent rods as in the picture.
With the custom-made pedal in place, weld at a 90 degrees an extended crank and pedal. To make this extension, you will need to weld a rod to an extra crank to achieve the required double length -- about 13 inches. You will not want to place too much of your weight on the outside pedal so use the inside pedal for pushing off and when stopping.
Simply use 5" of tubing that will slip over the rod and weld two 3/8" bent rods as in the picture.
With the custom-made pedal in place, weld at a 90 degrees an extended crank and pedal. To make this extension, you will need to weld a rod to an extra crank to achieve the required double length -- about 13 inches. You will not want to place too much of your weight on the outside pedal so use the inside pedal for pushing off and when stopping.
Step 3: Seats
To the seat post, weld a tube to form a T. Using a tube that wil slide inside the tube just welded, cut it to the length you want the seats apart from each other. Slide it in and now weld 2 short new seat posts at each end to accept the 2 seats. You can make both posts adjustable or just .one as I did since the original seat post can also be adjusted. Drill a hole across both tubes, insert a bolt and tighten with a nut. If weight combination of the riders does not work well, remove the bolt and slightly slide the inside tube with the seats to adjust. Drill across the inside tube starting from the holes already drilled on the outside tube and reinsert the bolt.
Step 4: Handle Bars and Steering
Only the left side driver will steer the bike so the left side handle bar will have a steering linkage. Weld tubing as shown to the left side of the head post tube. I used another bike's bottom bracket to make the steering mechanism. I welded a heim joint to the underside as well as another heim joint where the original handlebar used to be. I then connected the 2 heim joints with a tube acting as a linkage to make the steering possible. You will want to trim down the length of your handle bar so it does not interfere with the other rider. You could instead use a tie rod or perhaps sprocket and chain for the steering mechanism. Install the gear and brake controls onto this handle bar. Now weld a fixed handle bar for the right side driver and you are ready to ride! Since all that welding requires removing of paint to expose the steel, you will want to prime and paint at this time.
Step 5: Riding
As the driver, place your right foot on the inside pedal (closest to the frame) at the bottom most position. Left foot on the ground. Hold the handle bars firmly while the passenger sits on the seat and puts both feet on the pedals. At this point, three feet are on pedals and the driver's left foot is acting as the "kickstand."
You then push off while releasing the brakes. I find a few pushes helps to get enough momentum for balancing. Get seated and start pedaling while the passenger begins to help with the pedaling. The bike will lean slightly to one side when there is a difference in the riders' weights but this is normal as it helps in maintaining good balance. Once stopped, both riders should place the outside foot on the ground. Now enjoy an exciting ride in the park with someone special while socializing all the way. Oh what fun it is to ride side by side!
You then push off while releasing the brakes. I find a few pushes helps to get enough momentum for balancing. Get seated and start pedaling while the passenger begins to help with the pedaling. The bike will lean slightly to one side when there is a difference in the riders' weights but this is normal as it helps in maintaining good balance. Once stopped, both riders should place the outside foot on the ground. Now enjoy an exciting ride in the park with someone special while socializing all the way. Oh what fun it is to ride side by side!
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Some people ignore this law, and them they take almost all the street when cycling in group. But that is another matter...
Saw one of these on the road this summer but because of traffic was unable to show the others in the car.
Had almost convinced mysely that the design was too unstable to work.
Actually, it's extremely stable -- much more so than an ordinary single bike or a tandem -- because it tips over so slowly. Why? A bike's axis of rotation passes through the points where the rubber meets the road. The Sociable's two riders are farther away from the axis of rotation than the rider of an ordinary bike, so the rotational moment (aka "inertia") is about 50% higher.
A Sociable has a short wheelbase, like other bikes but unlike a tandem. You can ride it in amazingly small circles, feeling comfortably balanced. It doesn't care whether rider weights are balanced. In fact you can ride it solo, no passenger on the other seat. (it leans to one side, and you have to keep a constant push on the handlebars in order to ride straight, but it's doable, and you're riding single only as far as your sweetie's home, right?)
On the other hand . . . it also has MUCH higher wind resistance, and upwind pedaling can be really tough. Storage takes a surprising amount of space.
Only one problem : starting the thing seems to take time (a slope does help, if I understand) : how will yu manage not to be late at work ???â¦
LOL
Congratulations. This is awesome.
In Berlin( Germany) you can rent a buddy bike @ buddybike.de
Regards
Andrea
Instead of having both center pedals down at the same time, put them 90 degrees apart, so when one rider has their pedals up & down, the other rider has theirs front & back. This makes for a much smoother ride with more even power distribution, it's like changing the firing order on an engine :)
have both inside pedals down. Couples on side-by-side racing is next?
You should have used this song for the vid http://www.youtube.com/watch?v=coaiVbIZC-k
Does it pull to the side of the heavier rider at all? Whats it like on hills or is it just for fun on the flats?
Portrush a seaside town in N.Ireland used to have 4 wheeled bikes for hire, they where like 2 Raleigh Choppers welded side by side. I can remember seeing them back in the 70's when i was a kid but was never big enough to be able to go on one, sadly they fell out of fashion because of the increase in road traffic and a few minor accidents and finally the town council banned them before anything serious happened.
Would be fun to see other builds.
btw I did say toeclips there. Personal choice, but without them you have a high risk of someone's foot slipping off a pedal. On an ordinary bike, you'd instinctively pause in your pedaling and reach out with the loose foot, no problem. On a Sociable, though, the other rider may keep pedaling, and it gets tricky for your foot to find the pedal. In fact, you're likely to pause in your pedaling, and now both feet have lost their pedals.
LMAO this is funny. I can imagine what steering feels like.
.Have a super great Christmas from John , Cornwall, Ontario, Canada ............