The document provides instructions for building a recycled bike trailer using old bicycle parts and minimal additional materials. The trailer is designed to carry heavy loads and be pulled by a bicycle to transport goods, tools, water, and more. Key steps include measuring and cutting frame parts to size, drilling holes for the wheels, attaching the wheels, and creating a flexible joint between the trailer and bicycle using a pipe bender inserted into handlebar sections. The goal is to produce a low-cost, simple trailer that can be assembled by anyone with basic technical skills.
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1. Recycled Bike
Trailer
Design: Richard Andrews
Realisation: Ian Benford
Illustustrations: Henry Godfrey
Thanks to Maya Pedal and Re~Cycle
2. Introduction
Transport of people and goods is vitally important little as possible with the safe and comfortable
to any economy . Where motor vehicles are not handling of the bicycle. This is achieved by
available, a sturdy bicycle trailer will enable mounting the trailer to the cycle's rear axle (rather
traders and farmers to move goods, machinery, than the seatpost) using a specially designed,
tools and materials further and faster than they flexible joint (again using bike parts!).
could ever be carried on foot. Fetching water is
another critical use, rather than carrying it or Please note that if you make refinements to this
using a wheelbarrow, leading to saved time and design, we would very much like to include them
cleaner / healthier living. in these documents. Please email
henry@laikadesign.net with suggestions. Updates
We set out to design a robust, low cost, simple will be posted at www.re-cycle.org
trailer made from globally available materials and
unwanted bicycle parts. Any moderately Also; Please do not copy this file to your own
technically minded person can succeed in this web site. Please link to it. This way, your viewers
project. will benefit from and take part in the evolution of
this amazing trailer.
Ideally it should be welded together using a
simple arc welder, or it can be assembled using
nuts and bolts if no welder is available.
It has been designed to carry heavy loads (up
to 100kg) and has been refined to interfere as
Ingredients
Old bicycle parts:
Hacksaw
2x Forks of the same length. Avoid extra thick Vice (optional)
mtb/bmx forks as they do not allow for attachment 10mm spanner
to the frame using the standard spindles. Adjustable spanner
1x Bicycle frame with standard top tube (not Drill + 3mm, 6mm and 10mm drill bits
ladies style) Pliers
1x Standard type stem (not A-headset) Metal File
Handlebars (aluminium racer or steel straight Arc welder (optional)
bars)
2x Wheels, 20" or smaller. * A pipe bender (or plumber’s spring) is a metal
tube made from spiralled steel, essentially a very
To buy: strong, tight spring. It is normally inserted into
metal pipes allowing them to be bent without
4m of 25mm angle-iron them collapsing. Here it is used to make a flexible
150mm of 3mm wire rope joint between the bike and the trailer. it has the
2 Small U-clamps crucial benefit of being flexible without expanding
1x Length of pipe bender* or compressing.
Metal Primer
If you plan to bolt your trailer: Alternatives include hydaulic hose or thick guage
5x 6mm bolts (50mm in length) bike lock cable.
10x 6mm bolts (20mm in length)
15x Nyloc nuts
Tools needed:
3. 1. Lay one fork onto the ground
x2+ and measure the distance
from the crown to the
dropouts.
Multiply this measurement by
two and add 5cm (2”). This
will be the length of your
trailer.
Any longer and it may be
unstable when loaded.
2. Cut two sections of angle-
iron to the required length
(given by step 1).
3. Decide how wide you would
like the trailer to be. Ideally it
should be between 40cm
(16”) and 90cm (3’).
between 40cm and
Cut two sections of angle-
iron to your chosen length
and position at the rear end
and at the middle point.
Tip: You may wish to design
the trailer around a standard
size, e.g. bread crate, or water
barrel.
4. 4.
The final cross section needs to be
long enough to attach both forks to.
Before welding or bolting, ensure that
the sections are all square and that
the forks are parallel with the trailer
frame.
parallel
parallel
Mark the points where the wheel axles
5. will go through trailer frame and drill
holes on both sides first using a 6mm
bit, then widening with a 10mm bit.
Its very important to get the holes
centred for the wheel axles. Too low
and its difficult to get the nuts on, too
high and the angle iron will be
weakened
Now you can weld or bolt the frame
together. If you plan to bolt the trailer,
you can use the brake holes at the
top of the forks.
From your bicycle frame, cut
a section that includes the top
tube and the seat tube. This
6. will form the towing bar.
Bike frames ofen have a
variety of tube diameters. If
you have a selection to
choose from, choose one that
will snugly accomodate the
fork tube and the stem.
Also remove the stem and the
Stem
handlebars.
5. 7.
Cut off the right-hand
fork stem and file off the
rough edge.
The next part is the towing bar.
It needs to line up exactly with
the left hand rear wheel mount.
The section of frame
should fit over the fork The towing bar will be welded
stem giving extra in place later.
strength.
The stem fits into the
top end of the towing
bar.
8.
The angle and length of your
towing arm will vary according
8. to the size of your wheels.
Attach the wheels and place
your trailer onto blocks so that
it is completely level.
When lining up the arm to fit
onto the fork stem, so that the
Min. 4” (10cm) trailer is level and the bike
centred, use a felt tip pen or
similar to mark the points on
both parts. These can then be
lined up in a more convenient
position for welding or drilling.
6. 9. The joint between the trailer and
the bike is made from a bicycle
If no pipe bender is available,
hydraulic hose or a section cut
stem, two sections of handle bar from a thick cable bike lock can
and a section of pipe bender. be used to make the flexible joint.
Pipe bender is ideal because it An alternative to using the handle
will bend in any direction, but it bar stem, is a curved section of
will not stretch or compress racing handle bars. cut so that a
causing the trailer to lurch back right angle is obtainable, and fit
and forth. in a similar way using the flexible
joint.
10.
The shorter section of handlebar goes
into the stem.
The pipe bender should fit into handle
bar sections.
The longer section of handlebar is
flattened at the end and drilled with a
10mm hole. It can be flattened using
a vice.
Steel cable is used to keep the joint
together. U-bolts secure it at both ends.
To strengthen the
joint, weld or bolt the
stem in place. Two
bolts will be needed
to prevent the towing
arm from twisting.
7. 11. To attach the trailer, use the
bolts that hold the wheel.
For quick release wheels,
remove the spindle and insert
the attachment
between the frame and the
wheel. Replace the spindle
and re-tighten.
Tips:
File all sharp edges as children will like
to touch your trailer.
Load the trailer with the heaviest items
in the middle.
You may find it convenient to add a
stand to your bicycle.
Avoid using inner-tubes with unusual
valves. Stick with Schrader (car type)
valves or use the same as fitted to the
bicycle.
A bolted trailer can get out of shape.
Finishing: Line the trailer with whatever is available. Carry a spanner for adjustments
Plywood is reasonable light and weather resistant. Metal
merchants sell mesh in sheets that can be welded in place. Bolted trailers need a sturdy base.
Prime the metal with rust inhibiting (zinc) primer or
Hammerite.
Warning: Car drivers do not expect bicycles to be towing
trailers! Paint yours with bright colours to make
it more visible. Add lights, reflective tape or even a flag.