How To Build a Quadricycle Without Welding

How To Build a Quadricycle Without Welding - To be interesting and, if it's feasible, a cute car (not to make you feel embarrassed during the rides) however, without complex features and a "perfect" finish - it will look as basic and easy DIY project
It was built by us, just for us. 

How To Build a Quadricycle Without Welding

There is no need to please anyone else overly, or to modify it.

Never intended to sell plans or even the possibility of creating similar plans in a professional manner in a small-business way.

In at the start, I outlined certain goals that would be useful if they were accomplished:
  • To share rides along with my partner (but also on my own) in the last, I'll be pedaling only for me, to keep things simple.
  • To ride in a way that is comfortable (leisure location, easy step-in/out to ride in a comfortable manner, sun/wind protection).
  • To avoid any building issues to avoid problems with building: no cutting or modification of bicycle frames, by using the tools and knowledge I have , and to be a good neighbor to myself when the building process.
  • To attain safety elements to achieve safety factors. General and our particular in that neither is an experienced riders (good stability in the saddle, safe and precise brakes and steering, some protection against the impact of cars.

In the beginning

I sketched a few basic sketches to test my ideas and the possibility of implementing in various variations.

In the meantime, I purchased two MTB and took all of their measures to evaluate the possibilities of several variations (cutting or not cutting the frames, making them longer and etc.).

Then, I took all the main body measurements, in order to establish the correct postures for sitting in a steering position, pedaling and seating.

It was decided to just join two normal MTB and a tandem seat between frames.

The First One That Has Us Both Pedaling

There was a lot of it due to too many mechanical problems and the difficulty of simple to design seating positions for the easy design.

The Second Variation

With a wooden structure between bicycles frames, I was driving and pedaling ahead and my wife sitting at the rear.

We were flooded with compliments until it was almost done.

It proved that my position isn't as good as I had hoped.

Important advice At the start of construction, create a the simplest and cheapest wooden stick model that is large enough to determine the seating position as well as steering and pedaling.

This, the quadricycle was close to being "destroyed", just keeping certain metal parts (modified) Then, all started from the beginning.

Building Process

Tools used were easy to use electrical grinder, electric hand-drill, later welders (just to fix new pedals) as well as a variety of simple and inexpensive hand-tools.

On the floor, I draw a an oval shape for the purpose of keeping a straight bottom of the quadricycle.

I also have wooden sticks to help. I was the only person working without any assistance from "third hand".

The bung-cords and claps were useful.

Same brand new metal chairs I fashioned to use following the abounded central wooden piece.

I made use of a square frame made of metal from the second version as well as modified / shortened frames, tubes, and pipes I found in the garden, a garden centre in the hobby house.

Shopping many times for something useful for the next stage, which is affordable and practical.

Everything can be seen in photos and I believe that they don't require sketches or specific explanations.

Anyone can discover the same or different but useful for their own use.

Front seat was made up of two garden chairs made of aluminum.

The "saddle" is DIY, something larger than normal and much more comfortable.

I need a better cover.

The construction of all connecting parts is made up of a variety of metal components (aluminum chromed steel, galvanized steel and gray iron) I picked up a high-quality base paint and coated all of it, including bicycle frames.


I chose to make simple crank-shaft DIY pedals connected to the front sprockets (screwing them in the location of the original pedals that were removed).

In the initial testing I found that screws did not work well for keeping the system in place regardless of the methods I tried.

Therefore, I purchased a cheap welding equipment (birthday present to my wife) and weld every joint in my backyard.

I'm thinking that photographs are descriptive enough?

To add flat bars are made of aluminum 5 mm thick and 50 mm wide strips.

In the middle are two plywood strips with aluminum sandwiched between them.


The major component of the steering system is the regular MTB Front forks.

They are linked with trapezoids to the fixing points for the axle, so Ackermann principles are obtained.

The steering mechanism is controlled with two handles, which were modified from bicycle handlebars.


The brakes used are the original rim-brakes.

Commands are mounted on the mentioned steering arms that can be employed in any combination of either rear or front either left or right or all three if necessary.

The rear derailleur controls the original controls that are located on the steering arms that are one to each wheel.

This, both rear wheels are powered, but it is possible to change this by the removal of the right chain.

The original saddle points have included commands for front derailleur systems with one command for each sprocket on the front.

As stated, both must be utilized, however it is possible to use just one as explained previously.


As I said, the my wife's front seat is built by joining two garden chairs made of aluminum.

It's comfy and gives adequate support for feet and body, but it is also very well fixed to the on the front of the quadricycle.


Testing was performed by myself on my quadricycle.

My wife was busy the garden and preparing for our great trip to Belgrade.

Overall, I am happy with the quadricycle's performance although there are things that could be better executed next time.

My sitting position is comfortable and has excellent active and passive visibility.

Comfortable driving is excellent without bending and shaking of the construction.

It is easy to steer and precise.

The turning circle isn't as small as I'd like it to be however it's sufficient for the city's roads and doesn't have difficulties with corners.

It is simple to pedal even with heavy weight.

I did not measure the maximum speed, but it's comparable to other bicyclists riding on the streets with the exception of top-of-the-line cyclists.

I'm not sure about hill climbs, as I did not attempt one of them.

In any case, they can be avoided since I don't have a strict requirement to conquer them all.

The steeper streets can be avoided, too.

The majority of the city as well as the surrounding countryside is flat.

If I decide to utilize the derailleur system, I can explore some hills.

I'm guessing that with two of us, I would have to pick roads and streets that were flat to avoid sluggish speeds.

What would I try to do differently next time?

Perhaps! If I do more tests, at full weight, I'll determine what changes are needed (if there are any) regarding this particular one.

In any event I'd suggest "electrification" of it adding an electric motor, perhaps hybrid power, and other such things.

First to witness acceptance of this concept is by the general public as well as authorities.

The plan is to build the another one as we did considered at the beginning, in the style of classic velo cars with two-way (sociable) seating, and two of us pedaling together and also to think about an electric motors to avoid issues when climbing hills, which starting at traffic lights, and achieve speeds of up to 20 MPH or 32 km/hour.

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