I got tired of falling over when climbing off my old bike fully loaded with cargo. I looked for one that had all the things that I needed, like easy dismount , full MTB gears (for climbing hills with cargo), and a front rack that would not affect the steering when fully loaded with 50lbs or more. I could not find one at any price.

At the same time someone told me that the bike was too short for me. So I moved the seat back by making a special seat post, and I discovered that I could sit up straight (to relieve my carpel tunnel syndrome) and still apply my weight to the pedals, because the crank was slightly forward. 4.75 inches is 60 degrees from the seat; just like the old bikes made for sitting up straight. I still need to lean forward a little to climb hills. This crank forward also encourages me to pedal in circular motion.

So I worked a long time measuring and drawing to invent this one. And it took me a couple years to eventually build it.

Why don't people understand this bike?

It amazes me that most people just do not understand bicycles. I have writen so much about these machines that there is no excuse for not understanding why bicycles must change.

There are people that reject this frame concept merrly because they have not seen this kind of frame beofore. Obviously these people need to learn to think! try this book: "Lateral Thinking: Creativity Step By Step" by Edward De Bono.

Ergonomic angles

When I was designing recumbent bicycles I discovered the ergonomic power angle. When you want to design a bike just for you, measure for a 40 degree or more when climbing hills and a 30 degrees to the back of the seat for cruising. You can move around on the seat to get the right position.

Recumbent bicycle seats are usually set at 35 degrees with 5 degrees of adjustability.

Drive wheel

If you use a 24 inch wheel it will be like a lower gear that is good for hill climbing with cargo.It is better to have a lower gear than you need so that you can spin the crank fast, like bike racers do when climbing.

If you use disc brake in the rear and have a steep steer tube angle, you could switch wheels later and still have a reasonable steer angle.


You can build one of these fro around $400. Do the math your self, this editor keeps loosing my list of parts.

More info

To calculate seer angle try this one http://www.kreuzotter.de/english/elenk.htm

Find more info on bicycle design on my non-profit blog abut Utility Cycling Technology:




Step 1: Fixtures

The rear axle is higher than he front. A 24 inch wheel (that will give you an effectively lower gear) is one inch lower than the 26 inch.

For the second bike I will be using a fixture for the bottom brackets that will help keep the two halves of the frame straight, when clamped together for tack welding.

These hold devices should be mounted on a metal flat bar at least 5-1/2 inches wide x ¼ to 1/5 inch thick. Do not trust wood to be square and straight.

A frame jig of 1/2 inch steel plate would be very nice to have.

<p>I wish I had one of these.</p>
<p>I wish some bicycle company like Sun bicycles would make them. But it takes years to get them interested in a new concept. Just look at ow long it took for the Extra-cycle. Now several company make them. Write them letters.</p><p>see more bicycles of the future here <a href="http://commutercycling.blogspot.com/2011/08/ultimate-utility-bike.html" rel="nofollow">http://commutercycling.blogspot.com/2011/08/ultimate-utility-bike.html</a></p><p>and ask these people how much they would charge to build one <a href="http://hpm.catoregon.org/" rel="nofollow">http://hpm.catoregon.org/</a></p><p>I would make them my self, but no one would be willing to pay $3000 for the parts and labor.</p>
<p>I could build the frame for about $800... I will have to do some math.</p>
<p>Looks like about $500 worth of parts plus labor and wheels etc.</p>

About This Instructable




Bio: Read my non-profit blog about 'Utility Cycling Technology' I am the Professor! (Prodromal)
More by Prodromal the professor:How to build an Ergonomic Cycle Truck 
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