In fall of 2008 I (Bruce, trikebldr) bought a 2003 Speed. As I hefted it up to put it in the rack on top of my car I thought I would just throw it all the way over the car, it was so light. When I got it home I weighed it at 28lbs, complete with fenders. It made me wonder how light I could make my 2007 Speed. Stock, it weighed 31lbs.
I have a friend in Los Angeles who runs the computers that control the earthquake shift equipment under a high-rise building in downtown. He asked for a lot of pics, dimensions and weights, then plugged them all into this computer to do a stress flow analysis. It gave us back hundreds of diagrams that showed where the trike’s frame, and other parts, were most and least stressed under load.
DF bikes are made from butted and double-butted tubing to reduce weight. For those not familiar with the term “butted tube”, this means that the center has thinned out walls while the ends are thicker walled. These special butted tubes can be made in approximate lengths and cut to fit precisely into a DF’s frame. All trike makers that I know of use pretty much generic, uniform-wall-thickness tubing. It’s simply a matter of economics, since trikes of various frame design require too many tube lengths to be able to provide butted tubing for all parts of the frame. The old solution to non-butted tubing was to drill across the tube in the middle areas to reduce the weight. Tubes under side loading cannot be drilled, but those in longitudinal compression and tension can be. Most DF frames are completely triangulated, meaning their tubes are all under tension or compression, but not side loaded, appreciably. Trike frames are not so lucky!
Holey Spokes was drilled in those areas shown to be over-built as far as tubing wall thickness. The main, one-piece frame was drilled exactly as the computer showed, but I took some liberties on some smaller, easily replaceable parts. In the end the only area that I would do differently would be not drilling completely through the boom’s internal “peace” webbing. A stock, undrilled boom gave me 1/16″ of twist under heavy loading measured at the top of the der post, but the drilled version now gives me 1/8″ of twist, measured the same way. By loading, I mean causing the rear wheel to spin slightly with the front brakes on. This would not be acceptable for all you pseudo-Lances out there, but for me it isn’t a noticeable loss of efficiency.
A lot of criticism has been heard about drilling the cranks. You cannot drill most cranks, but the older Truvativ Elita cranks have a dog-bone cross section to them and the main strength is along the edges. Small, 1/2″ holes can be drilled with no problems. The most stress that can be applied here is until the rear tire breaks free, and I have done that, as well a stomping on them hard.
I have about 200 hours of drilling and de-burring in the project, as well as other tweaks to make it handle quicker. The wheels were tightened up to the max recommended spoke tensions for each rim. Ceramic bearings are used everywhere except in the Frog pedals. I have one set of Stelvio Light tires that are over 11,000 miles old and are much lighter than new Stelvios. I keep these stored except for special rides. I normally run newer Stelvios. I dumped the stock seat mesh and made up a new sling from a single layer of the stuff POC sells. It’s laced inside the seat rails with some parachute cord.
The cost to build this trike (other than the stock trike) was $12.53 for the materials to make the seat, plus about $183 for the new XTR Shadow carbon-cage rear der. The der weighs just 181grams as opposed to the 495grams for the stock Deore der. I was already running Q-rings and hollow-pinned chains, so throw in a bit more money for those if you must. Ceramics for the whole trike run about $500 for everything, including BB and idler.
The base trike weighed 31lbs, 3oz when I started. Set up for final weighing, with the lighter tires, no headrest, mirrors, bottle cages, it weighs exactly 24lbs. I normally run it with newer, heavier Stelvios, one mirror, one cage and a POC headrest. Set up like that it weighs at 25lbs, 14oz.
Holey Spokes drew a lot of flak on the Catrike forum as it was being built. Comments like “fold up around his ears” were found often! The drilling was not done helter-skelter like so many bikes were in the old days. It was done carefully according to indicated high and low stress areas. It’s now three and a half years old, and I ride it about 3000miles a year. I almost always pull my dog in her trailer behind it, too (another 56lbs, total!)! If Cindy is pulling the trailer, I get carried away and take a lot of curves on two wheels. After all, higher performance in handling was what it was built for. I prefer to bicycle it rather than slide through a corner.
I have weighed between 207 and 225lbs during the last 3-1/2 years, so it has endured a lot of heavy abuse from my riding style, with no failures yet. The reason is, those drilled tubes are not being BENT, but are under tension or compression. The seat side rails were not drilled specifically because they are being pulled sideways, inward from the weight of the rider in the mesh. There’s one short video in the link to my pics of this trike, showing me bicycling the trike as well as doing hard stoppies. This is pretty much normal for me while I wait for others to get ready to ride. It’s just a fun trike to play with like this!
About six others have test-ridden it and two of them have had me do this treatment to their’s. One is a 2008 Speed, and the other is a 2007 Pocket, called Piccolo Pockets. I consider the 2007 to be the very best Speed of all models, especially to do this with.
According to the Field:
My tricycle weighs 83 pounds, and, when loaded for a summer journey of several days, it is made to carry myself, 196 lbs, and an overcoat, spare clothes, a book, sketch book, colors, etc to the extent in all of 221 lbs. I have always a comfortable seat to sketch in, or to rest in when I need, with great ease in driving. Although I can put it along on level ground at the rate of 8 or 9 mph, I seldom cover more than 6 in traveling/ but the road must be very bad to reduce me to 4 mph.
If you are around downtown Boise for long, you will notice an unusual trike driven by an interesting looking fellow. Dawson’s coffee shop is a likely place to run into the driver, which I recently did. It is a handmade trike designed and built by Greg Allen.
They are pedal assisted, but run primarily on battery power. He used lithium for long life, and lead acid for quick take off. This is about the 17th model he has built, and each version has some different features.
If you think of technology as a work of art, Gus has taken the technology to a new level of art in his wooden bikes. Here are the two I have seen:
more photos here, and here. Gus has a blog here with more details their construction. You can drop him a line with questions at <firstname.lastname@example.org>
The Puprunner Trailer for Doggies!
I have had the opportunity to test drive the Puprunner trailer, a trailer made for dogs and their owners. Full disclosure: the makers, the Carters, are clients of my patent law practice and we are getting a patent on this device. Their website is HERE.
We hooked up this trailer to my Catrike Speed, which is a recumbent trike. The hookup was very easy, and didn’t take more than a few minutes. The photo above shows the Puprunner in a configuration where my dog Ginger can trot along behind my bike. The Puprunner does this by having the floor made of two panels which hinge up and attach so the dog can be on the ground. The idea is that after a few miles the dog might be tired, but the bike rider might want to cover some more miles. When that point is reached, the floor panels of the trailer hinge down, and the tired pooch can ride. It really works, and my dog who is very sweet, but not very bright, figured it out on the first ride.
The Puprunner has a storage area in front of the dog compartment, and a sun screen that goes over the top. It is 33 inches wide, and weighs about 45 pounds. The photo above shows my dog in the riding position, which lets me speed down hills without leaving her behind. The dog is tethered by a chest harness to the frame, not by a collar. I was impressed and thought it would be perfect for a nice ride that is too far for my dog, but would allow her to get a workout.
Here is a comfy looking tadpole trike.
This looks like its chain drive, single speed, the rider’s back would be straight up, not leaning forward. I don’t see any brakes, but if it was direct drive, you could brake by resisting the pedals turning. This would work well today.
In 1974 MASA (Multi-Advanced Sports Action) (of Japan) created a new class of closed-course track racing. They set up the rules so tight that only one trike would qualify,……their’s! Japanese companies could do that in those days.
MASA was a Japanese company, but targeted the US with this form of racing. In 1975 they finally brought a few of these over here and did some exhibition races between their own staff. It never really caught on, but they still imported about 1500 of these into the US over a three year period.
There were some very minor changes made to the trikes over the three years they were produced, like the rear dropouts, the chain tensioners, seat materials, colors, elimination of a lot of the original chrome parts, and the elimination of the use of a mid-drive that followed the rear der’s movements (called a reciprocal-gearing system).
Since these trikes were focused on track racing only against like trikes, the lack of braking and their size was not a problem. Their wide, long front end was thought to be better protection for the rider.
Two major problems that kept them from becoming popular was the single, minimally effective rear brake and their humongous size (56+lbs). The Slingshot really was intended solely for track racing where braking was only used to adjust speed entering the corners. Even the disc brake on the rear of earlier models was way less than effective for street use. Later models tried the Bendix drum brake on the rear wheel, but still fell short of being able to lock up the wheel. The trike’s 56-65lb weight didn’t help with it’s stopping problems either.
Earlier models came with an aluminum ‘wing” over the front axle, probably more for looks than anything, and a bullet-shaped, sports car-styled rear mirror on the left side. The chain and front sprocket was also completely enclosed in an aluminum guard. They were very high tech looking machines, but too heavy to compete with any other HPV around.
The first year only came in red or yellow, with lots of chrome on the front end. The second and third years offered the orange and black colors, with the loss of all chrome on them, except the rims. The one you have there now is a very late first year model, with a tan seat and simpler, single cog rear jack-shaft on the driveline. It still has some of the chrome on the steering components, but not all. It is a transition model. The seller claims it to be original paint, but that’s not true. Orange wasn’t introduced until all chrome was eliminated. Black also came out first, with all parts painted black, then the orange was added to the frame only.
One last feature that also killed it was it’s tendency to flip over in high speed corners! The rider’s center of mass was closer to the rear wheel than the fronts so it wanted to tip that rear wheel over, and the front wheels couldn’t stop it with so little weight on them. It as about a 30/70% weight distribution on them, front to back, whereas our current generation of tadpole trikes average about 60/40% front to back.
This has got to be the Ferrari of trikes, but at $11,000 it should look sexy. I don’t know if it is a trike or a work of art, or both. Check it out at Innesenti trikes.
I’m guessing this cool little tadpole trike is from the 1950s, judging by the stylin’ hairdo. This photo from the site “Modern Mechanix, where “yesterday’s tomorrow is today.”