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#11
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STI and cables
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#12
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STI and cables
On Mon, 11 Aug 2008 09:41:43 -0700, "Mike Jacoubowsky"
wrote: Slightly off-topic, but do you think the newer Shimano 7900 system, which pulls a great amount of cable per shift, might have fewer cable breaking issues? My thinking is that the larger the radius of the part that spools up the cable, the less stress from having it wound up tightly. That's possible. To add to your recommendation about regular replacement, an alternative or complimetary approach for riders capable of changing their own cable is "replace at the slightest sign of trouble." |
#13
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STI and cables
On Mon, 11 Aug 2008 18:21:25 GMT, Peter Cole
wrote: STI, other than the shape of the shifter, isn't any different than any other indexed shifting method -- IOW, there aren't any unique cable requirements. Yeah, though a "problem" is that it's hard to see the spot where cable typically fail, whereas with downtube shifters you will see (and often feel it) if a single strand breaks. |
#14
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STI and cables
Mike Jacoubowsky wrote:
Slightly off-topic, but do you think the newer Shimano 7900 system, which pulls a great amount of cable per shift, might have fewer cable breaking issues? My thinking is that the larger the radius of the part that spools up the cable, the less stress from having it wound up tightly. absolutely, yes. |
#15
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STI and cables
"John Forrest Tomlinson" wrote in message
... On Mon, 11 Aug 2008 09:41:43 -0700, "Mike Jacoubowsky" wrote: Slightly off-topic, but do you think the newer Shimano 7900 system, which pulls a great amount of cable per shift, might have fewer cable breaking issues? My thinking is that the larger the radius of the part that spools up the cable, the less stress from having it wound up tightly. That's possible. To add to your recommendation about regular replacement, an alternative or complimetary approach for riders capable of changing their own cable is "replace at the slightest sign of trouble." Yes, but there are so many things that can contribute to a "slightest sign of trouble" while shifting. If someone really knows what they're looking for (the bit about being able to shift to a larger cog/chainring but some difficulty coming back down), then maybe. But in my experience, it doesn't take long to go from one or two broken strands to a completely-failed cable. Worse, sometimes a broken cable can be a nightmare to remove. --Mike Jacoubowsky Chain Reaction Bicycles www.ChainReaction.com Redwood City & Los Altos, CA USA |
#16
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STI and cables
On Mon, 11 Aug 2008 23:00:35 -0700, "Mike Jacoubowsky"
wrote: Worse, sometimes a broken cable can be a nightmare to remove. Sadly, I know this all too well. |
#17
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STI and cables
On Aug 11, 10:39*am, "Mike Jacoubowsky"
wrote: With my Dura Ace STI the chain clanks lightly when I am in big ring and middle cog. It is adjusted properly for the limits. A knowledgable friend recommended replacing the cables etc I am looking at replacing the cassette, chain, and cables. *Is this all worthwhile? I wouldn't bother with replacing the cables until they're broken. A broken gear cable, on the "wrong" side of the hill, can really wreck a ride. And the symptoms of a failing gear cable are so subtle they're rarely recognized. The most-common is the ability to shift to a larger sprocket, but reluctance for it to shift back down. We don't replace gear cables often enough for our customers, because they don't call attention to themselves. The timeline for the failure mode is simply too short and rarely times itself just right for when it's in the shop. That's why I think replacing them every 7k miles or so isn't such a bad idea. --Mike Jacoubowsky Chain Reaction Bicycleswww.ChainReaction.com Redwood City & Los Altos, CA USA Agree. Cheap and easy fix to most shifting problems. Inner wire is stainless, housing is not. rust, corrosion, general gunk both in the housing and BB guide(change that every so often as well). We do der cables and hoousing just about every delex tubeup. That along with a new chain and bar tape, makes the bike 'seem' new. |
#18
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STI and cables
On Aug 11, 10:41*am, "Mike Jacoubowsky"
wrote: Slightly off-topic, but do you think the newer Shimano 7900 system, which pulls a great amount of cable per shift, might have fewer cable breaking issues? My thinking is that the larger the radius of the part that spools up the cable, the less stress from having it wound up tightly. --Mike Jacoubowsky Chain Reaction Bicycleswww.ChainReaction.com Redwood City & Los Altos, CA USA I'll bet but again slightly off topic, since the shimano boys and girls talk to you. Is the 7900 STI compatible with 7800/7700 derailleurs? I have heard, yes, no, and yes to rear der. only. Same for brakes, 7900 levers and earlier brakes, I have 'heard' yes, no, sorta, and vice versa, 7900 brakes and older STI. |
#19
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STI and cables
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#20
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STI and cables
Ben C wrote:
I wouldn't bother with replacing the cables until they're broken. Um, replacing the cables _before_ they break seems to be a better idea. Cables (the inner wire) are dirt cheap, and you depend upon them. Me, I replace mine every winter. For $10, tops, it's one less thing to worry about on a steep descent, or when you are 50 miles from home. -- David L. Johnson I believe that the motion picture is destined to revolutionize our educational system and that in a few years it will supplant largely, if not entirely, the use of textbooks -- Thomas Edison, 1922 |
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