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Why no fenders, lights etcetera on bicycles from factory?
On Wed, 18 Nov 2015 19:10:27 -0800, Jeff Liebermann
wrote: On Thu, 19 Nov 2015 06:09:20 +1000, James wrote: On 19/11/15 03:07, Jeff Liebermann wrote: On Wed, 18 Nov 2015 15:21:13 +1000, James wrote: On 18/11/15 12:33, Jeff Liebermann wrote: Also, I'm still tinkering with wire rope and plastic drive chains. The wear on the plastic parts can be horrendous, but I think I can make something that will last a race, ride, or tour. I'll wait for the ceramic version. Ceramic bits are always faster. Why wait? There are plenty of ceramic bearing vendors. For example: http://www.ceramicspeed.com/sport/ However, I'm talking about the gears and chain, not the bearings. Or maybe just get rid of the chain: https://www.google.com/search?q=chainless+bicycle&tbm=isch I know what you were talking about. I know about ceramic bearings as well. When you have replaced the plastic bits on the wire rope with ceramic bits, I might take interest. Well, I tried the molded plastic beads on a stainless wire rope variety and had the plastic beads slip. In order to get a better grip on the wire rope cable, I went to brass, iron, and zinc beads that were crimped onto the cable. Crimping deformed the bead excessively, so I'm playing with the design of a stamping arrangement to literally shrink the diameter of the bead. That's where I'm currently stuck due to lack of time. Too many other (paying) projects. Bug me in about a year. Using my pull test, I'm finding that the softer metals work best for the beads because they cover a larger surface area of the cable. I don't think ceramic will work unless I mold it to the cable, and then bake it in a kiln. It's also rather brittle and might crack when the cable is bent. I don't see ceramic as a good solution for a cable drive. Somewhere I've seen round stainless balls swedged onto a cable which would likely work. But steel cable has internal friction and most cables require lubricating to improve longevity. And I suspect that the radius of any sheaves will also have to be considered. -- Cheers, John B. |
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