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  1. Z

    Fractional derivatives and suspensions.

    I got interested in suspensions when Dan Henry said tires and bearings last twice as long when you have springs. In the past the fork was designed as a spring. Then mountain bikes came along and they got rid of the spring to make them stronger. Sprung forks have a bit too much dive for me. So I...
  2. Z

    Anybody playing with regenerative shocks?

    These should be easy to make since those shake up flashlights use this technology. I'm not expecting high efficiency or even control just proofe of concept.
  3. Z

    The effects of hydrocarbons on Lexan

    I knew this was a problem but thought it was exaggerated. I made 4 panels to prevent my bags from getting into the spokes and had a bit left over so I made a spoke protector. I fixed this in place with copper wire. This bent it into a shallow cone. I knew Lexan could take a cold bend without any...
  4. Z

    Harbor Freight Chain Tool

    This tool was never designed for bicycle chains the pin is too fat. However it can be made to work if you are careful. Instead of pushing one chain pin almost all the way through you push two chain pins just through the outer link. Photo below. The reason I am bothering you with this is they...
  5. Z

    Wheelbot a gyro stabilized unicycle.

    https://techxplore.com/news/2022-08-wheelbot-symmetric-unicycle-reaction-wheels.html
  6. Z

    Adding spokes to wheels.

    I got ahold of several books on bridge design from 1880 to 1920. The old timers built rivited plates and pulled the apart. The rule of thumb for drilling holes in thin sheets is the holes should be 2 hole diameters apart and 1.5 diameters from the edge. Bicycle wheels are way past that and there...
  7. Z

    Available Spoke Sizes

    Myrons Mopeds has done an excellent job of discovering old spoke sizes on mopeds. There are several gauge system some of them going the other way. I would like a complete list. I measured spokes on a Chinese tricycle with 28 inch wheels and 40 spokes and they were 4.0 mm on the front and 4.6 mm...
  8. Z

    Lets design a spoke wrench.

    What I want is the round kind with 8 sizes. These are marked with the gauge sizes and there are a least 2 standards. So lets git of that. Mark them with the inch size and the metric size. I would like a .127 .130 .136 and .156. I don’t know what the 13 gauge standard is but I would like those...
  9. Z

    Thai drag bike tires.

    These showed up on a land speed bike built by Chris Garcia. Information is hard to find but it looks like they are available in 60mm and 80mm width for 17 inch rims. The rims are 1.4 or 1.6 inch wide. This is what I have been looking for something tougher than a bicycle tire but not too wide. I...
  10. Z

    Tallahassee coop has 27 Veorides

    These are the bicycle models with the battery box by the bottom bracket. The batteries are missing and the battery compartments are open. Other than that they seem to be in good shape. They are not going to sell you anything they want you to work for it. It will be quite difficult to become one...
  11. Z

    My model of spoke breakage.

    The following numbers are from a theoretical wheel with 36 14 gauge spokes. They are number of miles you can expect for the first 6 broken spokes. 10000 11930 13391 14637 15771 16812 Now you can multiply or divide this set of numbers by any other number and get a realistic wheel. If your first...
  12. Z

    Tire failure modes.

    I'm a touring clydesdale I have done 100000 miles with 165 to 190 pounds on the rear wheel. Kevlar tires last 5 times as long as non Kevlar tires if the failure mode is glass cuts. There are 2 main types of these tires. There is the belt or fabric mesh under the thread used by most makers...
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