Freewheel Adapters and Disc Brake Adapter
Delta Trike Axle Adapters - Freewheel Adapter (left) and Disc Brake Adapter (right).
Both the Freewheel Adapter and Disc Brake Adapter are black anodized aluminum
and fully drilled and tapped for a standard 6 bolt bicycle disc brake rotor
. The hardened 1/4 inch axle mounting bolt is also included with each adapter
, so they are ready to install onto your 3/4 inch axle.
We understand from your feedback that often a local machine shop will
charge a bundle to make only a few parts and you may have to wait
months to receive them. Another risk is a part that may not fit
perfectly, so we are stepping in to help ensure that your build goes
These Delta Trike Axle Adapters will fit any 3/4 inch trike axle
and allow you to install a Shimano type freewheel and a bicycle disc brake to the axle for drive and braking.
Our Delta Trike Axle Adapters will fit onto any cold rolled 3/4 inch
steel shaft, allowing you to install both a Shimano type freewheel and a
standard 6-bolt bicycle disc brake rotor. The adapter shown on the
left is designed for a disc brake rotor only, and the adapter shown in
the right will take a disc rotor as well as a Shimano type thread on
freewheel. The thread on freewheel can be a single speed BMX type, or
and multi-speed type with 5 to 9 chain rings. A hardened 1/4 inch bolt
(included) passes through the axle to secure the part to the axle.
Being able to mount a freewheel and disc brake to an axle means that you
can create practically any kind of delta trike or quad cycle using
standard bicycle components. All of our delta trikes such as the KyotoCruiser
use this adapter, as well as our StreetFighter
These parts can also be used on any of our other trike plans by using a
3/4 inch axle in place of a 5/8 inch axle. All future trike and
quadcycle DIY plans that we intend to release will be using these parts
as they are easy to install and service.
Hub Flange Discs
Our laser cut Hub Flange Discs will make it easier for you to build
your own delta trike wheels and save you time on your project. This Hub
Flange Disc is made with 24 spoke holes so that you can build wheels
directly onto any 3/4" axle using rims with 48 spokes.
The Hub Flange Discs are made of steel and are approximately 1/8 inch
thick as required by the plans. Spoke holes are 7/64" in diameter so
that standard bicycles spokes can be used.
Our Hub Flange Discs come in several varieties with various spoke
hole counts and axle hole diameters. Each of our DIY plans offer a
recommended axle size and spoke count, but you can certainly change this
to suit your design needs or parts availability. For instance, the Aurora Trike
can be built using rims with 36 spokes rather than 48 spokes, or the DeltaWolf
can be made using a 3/4 inch axle rather than a 5/8 inch axle. Please
make sure that you order the correct Hub Flange Disc size for your
To keep costs to a minimum, our Hub Flange Discs are laser cut from
flat sheet metal. Each disc will have a small imperfection on the outer
edge and inner edge where the laser started cutting out the disc. There
is also a mill scale on the surface of the metal that will need to be
removed using sandpaper or a sanding disc. Neither of these
imperfections will compromise the strength of the disc, and once they
are built onto your hubs and painted, the imperfections will be
The surfaces of the Hub Flange Discs are coated with a mill scale at
the factory to help protect the metal from oxidation. This coating
easily be removed using a sanding disc to prepare the part for painting.
The laser cut edges are also somewhat sharp, so they need to be
smoothed off using the sanding disc by running it lightly around the
Once the mill scale has been removed from the Hub Flange Discs, the
spoke holes will need to be beveled slightly to remove the sharp edges
around the holes. This is done so that the spoke exiting the flange is
not cut by the sharp edges of the hole. To bevel the spoke holes, use a
3/16 inch drill bit and push lightly into the hole until a small bevel
The beveled spoke holes are shown here after running pressing lightly
with the 3/16 inch drill bit to remove the sharp edges. The Hub Flange
Disc is now ready to be welded to your delta trike axle.
Remember, our Hub Flange Discs are sold as a set of four matching
discs, and there are several versions available, so please choose the
correct number of spoke holes and axle diameter for your project. These
discs are manufactured to keep costs to a minimum, so you will need to
bevel the spoke holes and prep the surface for painting, an operation
that will only take a few minutes per disc.
All of our DIY Delta Trike Plans make use of these Hub Flange Discs,
which allow you to lace a rim directly to the rear axle. By integrating
the flanges directly onto the axles, you’ll save some money instead of
needing to have complex and expensive machined hub parts made. Our
trike plans also include instructions on how to make these parts from
scratch, as well as a drawing that can be sent to a machine shop in case
you want to make your own hub flanges.
Our goal is to offer parts that save you both time and money when
building your own DIY bike or trike project. For more details and to
order, visit the AtomicZombie store