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#12
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How long should caliper brake springs last?
On Thu, 27 Jul 2017 09:57:44 -0700, sms
wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( -- Cheers, John B. |
#13
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How long should caliper brake springs last?
On 7/27/2017 8:40 PM, John B. Slocomb wrote:
On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( https://www.teachengineering.org/les...cancer_lesson2 "... structural materials that are able to safely endure everyday stress while remaining in the elastic region of the stress-strain curve, otherwise permanent deformation occurs..." For single pivot bicycle brake springs, simply reshaping a damaged spring by holding the center section in a vise and moving the ends to a symmetric shape is straightforward and simple. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#14
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How long should caliper brake springs last?
On Wednesday, July 26, 2017 at 7:40:49 PM UTC-4, sms wrote:
The brakes on my Specialized road bike were not opening all the way when releasing the brake levers. At first I thought it was the old brake cables having corrosion so I replace them, and I also put on a set of new/used levers, since the springs in the original levers were weak, but this wasn't sufficient. Went to a bike shop this morning and the shop was closed but the service area had an open door and I asked the mechanic about replacement springs. These are for Dia-Compe Edge brakes that came with the bicycle, circa 1987. The mechanic told me to just replace the brake set. I ended up buying a set of Ultegra 6800 calipers from him, with pads, that he had taken off a bicycle where the owner was upgrading. At first he wanted to sell me the whole Ultegra group for $300, which had a FC-6703 triple crank, but he sold me the brakes only, for $50. This is a much better brakeset than the original, but really I only needed the springs, I was just in a hurry.. How often should I have to replace brake springs. Since this road bicycle is about 30 years old I figure that the springs do fatigue over time. I think this is what I wanted: http://www.ebay.com/itm/DIA-COMPE-S-PULL-BRAKE-PART-SPRING-/282571492776?hash=item41ca92cda8:g:LiIAAOSwUFtZaPk c the bores/pistons are worn out of round ...not changing fluid over time is one cause in auto. Piston position goes up one end down other causing snubbing. prob not the spring ...spring are cushion not a ram. in auto, come x miles, you toss the lot n get new or in drums tinker tinker tinker. Iam for reasons of preventive maint...new to discs....major improvement over servicing drums. The four huge abs discs on muh E250 are a source of wonder leading to thoughts of GT40's glowing in the dark at the end of the straight. |
#15
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How long should caliper brake springs last?
On 7/27/2017 6:40 PM, John B. Slocomb wrote:
On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( Yet they are available online, so clearly someone has wanted them, and there are instructions online that refer to the need to replace weak springs. AMuzi shows them he http://www.yellowjersey.org/dcbitz.html |
#16
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How long should caliper brake springs last?
On Mon, 31 Jul 2017 14:50:53 -0700, sms
wrote: On 7/27/2017 6:40 PM, John B. Slocomb wrote: On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( Yet they are available online, so clearly someone has wanted them, and there are instructions online that refer to the need to replace weak springs. AMuzi shows them he http://www.yellowjersey.org/dcbitz.html So what? The point was to respond to your statement that, "the shops in Silicon Valley have little interest in stocking and selling little parts like this", and I would bet money on my statement that it was that "Probably because no one but you ever wanted to buy any". The argument has nothing to do with what is available on line or what Andrew stocks, but what the demand is in Silicon Valley". -- Cheers, John B. |
#17
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How long should caliper brake springs last?
On Monday, July 31, 2017 at 6:10:42 PM UTC-7, John B. wrote:
On Mon, 31 Jul 2017 14:50:53 -0700, sms wrote: On 7/27/2017 6:40 PM, John B. Slocomb wrote: On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( Yet they are available online, so clearly someone has wanted them, and there are instructions online that refer to the need to replace weak springs. AMuzi shows them he http://www.yellowjersey.org/dcbitz.html So what? The point was to respond to your statement that, "the shops in Silicon Valley have little interest in stocking and selling little parts like this", and I would bet money on my statement that it was that "Probably because no one but you ever wanted to buy any". The argument has nothing to do with what is available on line or what Andrew stocks, but what the demand is in Silicon Valley". You've been pretty snippy lately John. Is it your time of the month? |
#18
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How long should caliper brake springs last?
On 7/31/2017 5:50 PM, sms wrote:
On 7/27/2017 6:40 PM, John B. Slocomb wrote: On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( Yet they are available online, so clearly someone has wanted them, and there are instructions online that refer to the need to replace weak springs. There are? Where? AMuzi shows them he http://www.yellowjersey.org/dcbitz.html By that argument, people must have to replace flat-concave mounting washers too. Metal fatigue, is it? -- - Frank Krygowski |
#19
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How long should caliper brake springs last?
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#20
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How long should caliper brake springs last?
On 8/1/2017 12:42 AM, John B. wrote:
On Mon, 31 Jul 2017 18:29:23 -0700 (PDT), wrote: On Monday, July 31, 2017 at 6:10:42 PM UTC-7, John B. wrote: On Mon, 31 Jul 2017 14:50:53 -0700, sms wrote: On 7/27/2017 6:40 PM, John B. Slocomb wrote: On Thu, 27 Jul 2017 09:57:44 -0700, sms wrote: On 7/27/2017 7:08 AM, AMuzi wrote: snip In theory maybe but I've never seen that in real life. Rust is ugly but in terms of % reduction of cross section of a spring, it's meaningless. The spring is not rusty. But it pops out with no effort, it's just not springy anymore. It seems to be fatigued. The brake sets are cleaned and lubed. I may still order some springs to use these brakes on another road bike which has lower quality brakes. If I were in Wisconsin, I'm sure that AMuzi would have the springs in stock, but the shops in Silicon Valley have little interest in stocking and selling little parts like this. Probably because no one but you ever wanted to buy any :-( Yet they are available online, so clearly someone has wanted them, and there are instructions online that refer to the need to replace weak springs. AMuzi shows them he http://www.yellowjersey.org/dcbitz.html So what? The point was to respond to your statement that, "the shops in Silicon Valley have little interest in stocking and selling little parts like this", and I would bet money on my statement that it was that "Probably because no one but you ever wanted to buy any". The argument has nothing to do with what is available on line or what Andrew stocks, but what the demand is in Silicon Valley". You've been pretty snippy lately John. Is it your time of the month? Well, I admit that I have very little time for SMS, but I still contend that if sufficient people were to walk into Silicon Valley bicycle shops wanting replacement brake springs that even a Californian would be able to figure out that there was a market for brake springs and would stock them. Riders do indeed replace brake springs as part of clean/shine/polish/wax and throw out rusted bits. A bicycle brake spring can't travel beyond elastic limits unless it is removed from the brake: https://www.britannica.com/science/elastic-limit Which Frank noted earlier. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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