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Converting a Brake Cable To a Shifter Cable
Torch the end and shake off the solder until only a small nib is left.
Bret Cahill |
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#2
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Converting a Brake Cable To a Shifter Cable
On Mar 5, 5:39 am, "Bret Cahill" wrote:
Torch the end and shake off the solder until only a small nib is left. Bret Cahill Or go down to the bike shop and buy one. That brake inner wire isn't going to fit well and smoothly in 4mm housing, BTW- |
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Converting a Brake Cable To a Shifter Cable
On 5 Mar, 12:39, "Bret Cahill" wrote:
Torch the end and shake off the solder until only a small nib is left. Bret Cahill Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Simon |
#4
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Converting a Brake Cable To a Shifter Cable
Don't. Brake cable is slightly elastic - so that it's very strong.
Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Fortunately the metro bus managed to stop when I couldn't get into the small chain ring in time. Bret Cahill |
#5
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Converting a Brake Cable To a Shifter Cable
Simon Ceze writes:
Torch the end and shake off the solder until only a small nib is left. Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Oh! Explain how that can be so, considering they are both steel and the brake cable has a larger cross section. This is a tale I haven't heard yet although there is a difference between brake cable housing and shift cable STI housing. http://www.sheldonbrown.com/brandt/sis-cable.html Jobst Brandt |
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Converting a Brake Cable To a Shifter Cable
On Mar 5, 11:16 pm, wrote:
Simon Ceze writes: Torch the end and shake off the solder until only a small nib is left. Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Oh! Explain how that can be so, considering they are both steel and the brake cable has a larger cross section. This is a tale I haven't heard yet although there is a difference between brake cable housing and shift cable STI housing. http://www.sheldonbrown.com/brandt/sis-cable.html Jobst Brandt Mr. Brandt, Can you clarify why if both SIS (shift) and SLR (brake) housings no not compress, only SIS is recommended for the shifter? Your article states that the SLR housing would change length when bent, but in the case of indexed down-tube shifters (for which it was initially developed) the only housing is at the back leading into the rear D. But once the housing is installed, it does not turn or move so that the length would then remain constant. (The same argument can be used for the STI housing up front). I understood that the reason new housing had to be develop was that the SLR housing would indeed compress progressively with pressure, however minutely, so that indexed shifting would not be reliable across the entire cassette. Josh |
#8
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Converting a Brake Cable To a Shifter Cable
On 5 Mar 2007 21:45:25 -0800, wrote:
On Mar 5, 11:16 pm, wrote: Simon Ceze writes: Torch the end and shake off the solder until only a small nib is left. Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Oh! Explain how that can be so, considering they are both steel and the brake cable has a larger cross section. This is a tale I haven't heard yet although there is a difference between brake cable housing and shift cable STI housing. http://www.sheldonbrown.com/brandt/sis-cable.html Jobst Brandt Mr. Brandt, Can you clarify why if both SIS (shift) and SLR (brake) housings no not compress, only SIS is recommended for the shifter? Your article states that the SLR housing would change length when bent, but in the case of indexed down-tube shifters (for which it was initially developed) the only housing is at the back leading into the rear D. But once the housing is installed, it does not turn or move so that the length would then remain constant. (The same argument can be used for the STI housing up front). I understood that the reason new housing had to be develop was that the SLR housing would indeed compress progressively with pressure, however minutely, so that indexed shifting would not be reliable across the entire cassette. Josh Dear Josh, Brake cable housing compresses a bit, but it's very strong, so it works fine for the heavy loads of braking and your squeezing fingers adjust for the slight compression. That slight compression would goof up the much lighter, but more sensitive loads involved in shifting. So an almost compressionless cable was developed to allow accurate shifting. Paradoxically, the compressionless shift cable is weaker than brake cable--too weak for the heavy load of braking. So if you use stiff but weak shift cable housing for brakes, you run a strong risk of the cable housing failing just when you need it most. Basically, brake cable housing is wound tightly and its coils squish together under a heavy load, staying in place and compressing a little, while the shift cable housing is barely wound at all and can bulge and split under a heavy load. _____________________ ///////////////// ///////////////// tightly wound brake cable ///////////////// each of the many coils compresses a bit --------------------- / one brake coil / a single helix / ______________________ _ _ ' - . _ _ ' - . _ barely wound shifter cable ' - . _ much less compression ----------------------- _ one shifter coil ' - . a single turn every 100 mm 18 separate wires Cheers, Carl Fogel |
#9
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Converting a Brake Cable To a Shifter Cable
Carl Fogel writes:
Simon Ceze writes: Torch the end and shake off the solder until only a small nib is left. Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Oh! Explain how that can be so, considering they are both steel and the brake cable has a larger cross section. This is a tale I haven't heard yet although there is a difference between brake cable housing and shift cable STI housing. http://www.sheldonbrown.com/brandt/sis-cable.html Why take such needless offense, snarl, sneer, and make new enemies? Who should be offended when an anonymous poster under the guise of "Simon says" gives much incorrect advice without flinching. Besides, the FAQ item doesn't mention shift and brake cables, only housings. I didn't notice calling the writer any rude names accusing him pf lying or being stupid, as the peanut gallery does regularly and anonymously. I notice they don't draw your attention to sensitivities. Why not just explain that the cables are the same material, but that the cable housings are different and refer him to your far more pleasant article? What wasn't explained and is unpleasant about the words I wrote. They directly address the claims made with no extras. Maybe you could write a demonstration response to Simon's posting and show what you feel is appropriate. Jobst Brandt |
#10
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Converting a Brake Cable To a Shifter Cable
hcethgil? writes:
Torch the end and shake off the solder until only a small nib is left. Don't. Brake cable is slightly elastic - so that it's very strong. Gear cable is more rigid - for precise shifting - but that makes it more brittle. It is dangerous to use gear cable for brakes, and brake cable is too stretchy for gears. Oh! Explain how that can be so, considering they are both steel and the brake cable has a larger cross section. This is a tale I haven't heard yet although there is a difference between brake cable housing and shift cable STI housing. http://www.sheldonbrown.com/brandt/sis-cable.html Can you clarify why if both SIS (shift) and SLR (brake) housings do not compress, only SIS is recommended for the shifter? Your article states that the SLR housing would change length when bent, but in the case of indexed down-tube shifters (for which it was initially developed) the only housing is at the back leading into the rear D. But once the housing is installed, it does not turn or move so that the length would then remain constant. (The same argument can be used for the STI housing up front). I understood that the reason new housing had to be develop was that the SLR housing would indeed compress progressively with pressure, however minutely, so that indexed shifting would not be reliable across the entire cassette. I'm unclear on the question, but the difference between shift housing and brake housing is that SIS shift housing has strands lengthwise in a long helix the way cables have, and brake housing is made of a stack of rings (slightly helical). The centerline of brake housing becomes longer when the housing is bent, it standing close packed on the inside of the coils in the bend and having light between coils on the outside. Cable, on the other hand remains constant length because all its strands pass though the inside AND outside of a bend. That is why it must be helically wound. With indexed shifting and shift cable making every bend the handlebars make could cause a mis-shift or a jump out of gear. What the rear derailleur does is immaterial because its cable housing doesn't move while riding. Jobst Brandt |
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