Thursday, December 18, 2008


We are collecting tubing, frame, components and ideas for PROTO IV.

The first thing we will do is list our wants i.e.
Aluminum construction (strength vs. weight)
24 in. outside wheel ( rolling resistance vs. strength)
Removable sidecar (ease of assembly/removal)
Permanent mounted racks (reliability and versatility)
Internal mounted outside wheel (Flat step plate/more internal space)
multiple diameter construction (strength and joining appearance)
Front grab handle (ease of entry to sidecar)

Then develop a list of things we would be willing to sacrifice.

1. Load carrying capacity (removable aluminum sidecar)
2. high gears (internal multi speed hub)
3. weight (thick wall tubing)

After that we would brainstorm. (probably add to and take away from both lists)

Once we are convinced we are on the right track we will develop a wire model out of coat hanger wire. This is done by forming the wire with pliers and soldering the joints (measurements are not important at this time we are reaching for the general look)

When we are satisfied with the look or concept (many wires have been removed /moved and or replaced) we will lay out the base of the sidecar in full size (measurements just got critical) on the floor in chalk.

Now to the bender, using the pattern on the floor we shape the outside tubes and fit them together. The cross tubes are next. (we like to tape the tubes together in position)

The base is formed. It is time for the bicycle side top tube so refer to the wire model and go for it. Prop it up in place and fit in the uprights.

Move right on to the outside top tube, this one has the door in it and the outside wheel support.

After it is in place with uprights it will be wheel supports followed by grab handles.

What I have not mentioned at all yet is the donor bike we need to have already removed paint from the locations where welds will be attached.

For PROTO IV integral racks are an important part of the design concept. The outside edges of the racks (both front and rear) will be where the sidecar attaches so rack mount triangulation is extremely important.

Forming the racks will be similar to forming the sidecar but mounting to the bike and having clearance for pedaling and turning can not be overlooked.

With the bike propped in place next to the sidecar also propped in place the last fabrication component is the bike/sidecar connection (in reality this may at the last minute become a permanent mount) We will just have to see how it goes.

Of course after frame fabrication is completed there is still much to do with components, gears, hubs, brakes, handlebars, shifters, rims, spokes, tires, reflectors, cables, cable casings, pedals, toe clips, gooseneck, headset, crank, bottom bracket, seat post and seat. (not to mention paint)

As of yet PROTO IV does not have a name, it seems as though we need to see it in order to project a name onto it.

Very soon now we will have the wire model to show you. (we will post as soon as we have it)

Any feed back is really appreciated. (we do not say we will use it but we want as much input as possible)

Friday, November 14, 2008

Heinz Zeit introduction

You might be wondering what all this sidecar stuff is about, well we wonder that ourselves. We, Fritz an I, have now decided to make available as much information as we have discovered about sidecar bicycles having used them over the last ten years. We intend to present information on the theory,planning, fabrication and testing that it takes to produce a sidecar bike.

You might say "Why would we do this ?". Well we believe that a bicycle capable of carrying 500+lbs, two passengers or long heavy objects has a universal appeal and possibilities that we, in these times, have only begun to imagine. We will strive to answer all your questions and post them as we get organized. You will be seeing new sequences such as Tube bending, Wire form modeling, Joint mitering, Tack welding, Filing, Fitting ,Pattern making, Assembly sequence, Bike gear/brake theory, Appropriate wheel sizes it apples to bicycle sidecars.

The good news for all of you is that though my brother and I can be very "wordy"in person my typing skills are limited. So I promise to stay brief in my replies. As of now we are very satisfied with our progress. And with what we believe is a string of successes in the areas of bending, stability and comfort for both rider and passenger, we fully intend to be informative wherever possible.

Every where we go with these machines people say "I was going to make one of these for my dog! or surf board or..." Because of this, we are thinking that there are many others who have pondered these types of vehicles and might appreciate a little advise. If you're like me sometimes a single image or concept will open a whole vault of possibilities.

So lets collaborate. Now, ask away!

Thank You all. Heinz

Saturday, November 8, 2008

Old grey bringing home the HAUSFELD tubing bender

The estimated 30o Lbs of steel for the 175 Lb rider was not a problem but admitedly slower than usual.

PROTO III assy sequence 19

Out for a ride and what should we come across but a true classic. Note similarity of profile. The fins arent as sharp by design.

PROTO III assy sequence 18

The first ride, how sweet it is! Note handlebars here are low by comparison to what we wound up with. We really like a more upright position.

PROTO III assy sequence 17

By this time we're realy ready to ride but it still needs brake adjustments, chain and some finishing touches.

PROTO III assy sequence 16

Final assembly taking place.

PROTO III assy sequence 15

This view shows some of the features we thought were pretty cool like the entry handle, the rear rack/ seat and the front cage opening for long objects.

PROTO III assy sequence 14

Two more cans of paint and we're just about there.

PROTO III assy sequence 13

This after about 4 cans of spray paint. Note rear rack has mesh in it as does entry step. We used outdoor furniture paint figuring it would hold up better.

PROTO III assy sequence 12

This is a rollable but not ridable sidecar bike. We were so excited we took it out and pushed it down the street just to see how it felt. We were amazed.

PROTO III assy sequence 11

This view shows cage welded to frame. Note beginnings of rear rack and test painting for color match.

PROTO III assy sequence 10

This view shows the high inside wall and deck flair behind rear axel.

PROTO III assy sequence 9

This view shows entry top outside wheel supports and entry step plate mock-up. At this time we thought that the step plate would be a solid plate.

PROTO III assy sequence 8

This shows the welded cage with expanded metal skin. Note welds are unfinished.

PROTO III assy sequence 7

Mock-up showing cage bike seperation. This was necessary to insure sufficant clearence for feet of cyclest.

PROTO III assy sequence 6

Tacked cage showing paper entry step mock-up.

PROTO III assy sequence 5

PROTO III major tubes tacked. Note no inside uprights, no upper outside wheel supports.

PROTO III assy sequence 4

Further mock-up of bike attachments.Note upper rear attachment that was not used in final form.

PROTO III assy sequence 3

3/4 view .Note blocks supporting frame.

PROTO III assy sequence 2

Right view of same.

PROTO III assy sequence 1

PROTO III showing tubes taped together before welds. Note no attachment to bike ,this was to get a feel for position relative to bike.

Thursday, November 6, 2008

incomplete proto III

Gramps inspecting PROTO III welds. Note no skin on rear seat/rack or outside wheel step plates. Gramps as a young man worked as a welder at several places.

Wire model superimposed over bicycle

A little trick photography allowed us to visulize the general shape of sidecar and bike. Note beer stien holding wireframe.

Coat hanger wireform model

This is the coathanger wireframe model for conception of PROTO III. Note lack of entry matched outside wheel suports.


Note reorientation of frame. Also note smile on face of pedaler. We're havin' some fun now!


Note revised frame attachments. See attachment plate at rear between seat stays.

Original version of PROTO II

Note outside tilt of cycle. This made riding when empty very dificult. The bike always wanted to fall to the left.

Sunday, November 2, 2008


PROTO III nearinbg completion note no chain deraileur or rear brake.

Saturday, November 1, 2008

Heinz and Gramps.

Taking a break along the trail with PROTO I and PROTO III.

Jeinkel-Heimer the story On the Fritz


Since little is known about the origins of Ernst ‘Fritz” Jeinkel and Heinrich “Heinz” Heimer I would like to take this opportunity fill in some background information.

Legend has it that the boys Fritz and Heinz grew up best of friends. As children they were impressed by the two American brothers who developed flight: Wilber and Orville Wright. What impressed them most was their ability to argue back and forth about a project and come together with a plan that both approved. The boys also thought that being bicyclists was a great advantage to their understanding of the basic principles of physics. This idolization would serve them well in their future endeavors.

When they first got bicycles of their own, at ages seven and five respectively, they jokingly referred to themselves as the Wrong Brothers since their first experiments with the bikes did not go to well. A classic problem was trying to ride more than one person on one bike. Inevitably one would fall off, the handlebars, rear axel, top tube, rear rack or seat with the usual bumped head, scraped knee or other injury. Sometimes the bicycle would even get damaged. This led them to start wrenching on their equipment. Again these early attempts were fraught with problems. Wheel truing was virtually impossible for the youngsters, as was brake alignment.

Since the boys were raised in a neighborhood that was let’s say less than affluent, some of their early vehicular experiments used only three wheels. “When that’s what you got that’s what you use!” The test runs for these coasters was in a field down the side of a hill they dubbed “Kill-Devil Hill” in honor of the Wrights. Again many experiments went bad part way down the hill. But they did not give up.


They rode together a lot and time passed. As a teen Heinz acquired a part time job at a local bike shop. His tutelage there would serve him well for the rest of his life. Meanwhile Fritz in and out of service jobs was having difficulties finding a vocation. It occurred to him that a stint in the military would give him some direction so he enlisted. Because of a difference in ideology that turned out not to be a good idea.

The boys had, as they grew up, developed this concept that people should do what is right not necessarily what you are told to do. And what could be more right than combined human transportation? When they first saw a tandem cycle they thought they had found it. Riding tandems was something they totally enjoyed. The climbing power, the acceleration, the speed and even the look were the great parts but they noticed that it was difficult to talk to each other and hard to take anything along with them.


For a time an injury Fritz had sustained kept him from cycling but Heinz found a tricycle, single front wheel, covered seat at rear (a Bicycle Rickshaw from Asia ) and the boys could cycle together again. The problem with the big trike was that it was big, heavy, hard to pedal, hard to handle and hard to find a place to keep it. This led to brainstorming by the boys. Some of the things they wanted were a lighter vehicle, more standard parts, closer location for passengers and bigger payload.

After formulating an idea for transporting people who couldn’t walk Fritz took some old bikes and parts to Victor a metalworking friend and said “Could you weld these together so I can put a chair between them.” Victor in his usual relaxed tone replied “Oh, yea I could do that but when I got done it would look like crap.” Fritz rephrased his request, “Victor” he said “Would you consider these parts sacrificial and give me a platform beside my bike that is about five inches off the ground, four feet long and about twenty-six inches wide”. Victor replied “Sure I could do that”.


A platform bike was built. It consisted of a bicycle with an expanded metal floor to the right and an outside wheel to the right of that. Also there was a fold-up loading support so it wouldn’t tip when weight was put on the back of the bed. Unpainted and fresh from welding it was kind of ugly but it worked. Riding it around was fun but what ever you put in it stood a good chance of falling out and it was difficult to tie things in. The stock gears were too high to be practical and the stock wheels especially the outside wheel started to develop problems immediately. Heinz’s experience at the bike shop gave him the insight to build a set of heavy-duty wheels and develop a super low gear train. After riding the sidecar bike for a while it went back to Victor and got side-skin, tie-down loops and a grey paint job.

That bike now referred to as OLD GREY or PROTO I was used be the boys for many years and whenever any who saw it claimed “I always wanted to do something like that” the boys said “Go for it” hoping that the concept would grow. You see that Victor had done an amazing job of frame construction but was not interested in doing more.


It was years later that a close relative Eric had someone try to copy the original. It had some nice features but didn’t work quite as well. Heinz and Fritz saw the problems, offered suggestions and some materials. Eric used those and with some ingenuity of his own got the sidecar bike the White Wizard AKA PROTO II completed.


Now came the fun part. Using the experience gained from years of riding Old Grey and seeing how the White Wizard was made Heinz and Fritz ‘argued’ about the relevance of every detail on a sidecar bike. They argued about height, weight, wheel size, tubing size, closeness of cage, front and rear cage connections, pedal protection, and entrance and exit ability. In order to develop it Heinz made a miniature wire model. Eventually they agreed on a design. They then learned to bend tubing and to tack weld. After cutting shaping and tacking parts together they took their project to a welder (still unable to trust their welds) for frame completion.

Finishing the skin, filing the welds, painting the frame and installing the components went quickly after that. Now the sidecar bike the Blue Ferry or PROTO III was done. The Blue Ferry has turned out to be more comfortable and easier to handle than either of the other bikes.

Not satisfied to rest on their laurels a set of dished washers were added to the outside wheel of the Blue Ferry allowing the outside wheel to be micro adjusted for camber and toe in. Adjusting toe in turned out to be difficult because the cycle would not track without a severe steering oscillation. By adding a steering dampener the oscillation was virtually eliminated and Heinz was able to coast the Blue Ferry on level ground and adjust the dished washers to make the bike track straight. The scrubbing of the outside and rear wheel when turning was significantly reduced. And as an added bonus the steering damper also reduced handlebar pull when traveling over uneven surfaces.

The dominant belief now is that even though the steering damper they used limits the steering travel, keeping you from being able to turn around in the length of the bike, the benefits far outweigh the minor disadvantages.


This brings you pretty much up to date with JEINKEL-HEIMER development. From here the next step will be to pursue further development by creating PROTO IV. PROTO IV will be constructed of aluminum it will have a 24” outside wheel (as opposed to a 16” for PROTO I and 20” for PROTOS II and III) and hopefully a detachable sidecar. Projecting further out than this is difficult but so far bike frames have been just rugged standard bike frames. It is now only a matter of time before a custom sidecar specific frame and matching car are made. It is our belief that this cycle PROTO V will be a pre-production model.

Friday, October 10, 2008

New Logo

new logo
Here's the first draw up of our new logo. What do you think?

Saturday, September 27, 2008

Critical Mass 9-28

The JEINKEL-HEIMER side car bikes had their first debut at the San Francisco Critical Mass event yesterday September 28th. They were met with considerable interest, and will hopefully return next month with some more promotional organization. Pictures will be up soon!

Friday, September 26, 2008

Lifting Bodies

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More information and pictures to come soon. Check back often!