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Homemade U-lock rack support
On 2018-08-13 14:46, Jeff Liebermann wrote:
On Mon, 13 Aug 2018 12:13:05 -0700, Joerg wrote: On 2018-08-13 11:34, Jeff Liebermann wrote: On Mon, 13 Aug 2018 10:29:44 -0700, Joerg wrote: On 2018-08-13 08:27, Tanguy Ortolo wrote: Frank Krygowski, 2018-08-13 17:11+0200: Nice. If the appearance was bothersome, you could use a black tube held in place with black zip ties. Black tube, yes, if I can find some, but I only ever saw white tube in hardware stores. Black zip ties, no, bad idea, as they let the tube slide on the sides. I would rather use some black tape. Zip ties are also bad in terms of reliability. It seems UV rays embrittle them and then they just fall off. A while ago I chased and stopped an MTB rider whose rear brake hose had come loose because of that and was chafing on the rear wheel. Luckily I always have a snippet of wire in my tool kit. Zip ties, too, but those only for temporary fixes. You can buy UV resistant zip ties. They're loaded with carbon black that blocks UV. However, not all such zip ties are equally resistant to UV. Some of the cheap junk has much less than the recommended 2% carbon black. After having an antenna installation fall apart in about a year due to crumbling zip ties, I bought some that are genuine Polyamide 6.6 UV resistant per ASTM D-4066PA411. No problems so far after about 5 years: https://www.hellermanntyton.us/bundling-securing/cable-ties/standard-cable-ties-special-materials/ https://www.hellermanntyton.us/resources/materials https://www.solarpowerworldonline.com/2016/03/not-all-uv-rated-cable-ties-have-long-lifespans-on-solar-projects/ The one that popped was the stock tie from a high-Dollar Specialized MTB. I can't imagine them being cheap on zip ties. Metal is generally better. I can believe it, if the big $$$$ specialized MTB builder trusted the data sheets without testing. I had the same problem. The junk I bought at the local hardware store said "UV resistant" on the package, but wasn't. In order to test, polyamide (nylon) 6.6 should dissolve in sulfuric acid. (I haven't tried this). The residue should be mostly carbon black. By weighing everything, you can get a rough guess for how much carbon black was used. https://www.researchgate.net/post/What_is_the_solvent_to_solubilize_the_Polyamideexp ect_HFIP Or, pay the price and use a proper tester: http://www.testing-instruments.com/carbon-black-content-apparatus/ Or just use wire and be done with it. Not every little job has to turn into a science experiment :-) An experienced dirt bike rider told me that only a few things are essential. Rum, duct tape, bailing wire. In that order. -- Regards, Joerg http://www.analogconsultants.com/ |
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