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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I
rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? I would rather not bring the bike back to the shop, because he has a real attitude during their busy season. I have noticed that he is a lot friendlier when I ask for the same service in February (I commute year 'round in Chicago) - TIA - J. |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
Jay - BFri Commuter wrote:
30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? Yes, but... The shifting should not deteriorate in 30 lousy miles. I would rather not bring the bike back to the shop, because he has a real attitude during their busy season. I have noticed that he is a lot friendlier when I ask for the same service in February (I commute year 'round in Chicago) - TIA - J. Assuming you spent a fair amount of money for this recent installation service, take it back and ask (politely demand) that it work right. Just my opinion... BS |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
On Apr 28, 5:36 pm, "Jay - BFri Commuter" wrote:
30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? Turn the barrel adjuster till the jockey wheel of the derailleur is perfectly under the selected cog. It's not difficult. My hunches are that you'll need a half turn counterclockwise. |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
Just turn the barrel adjuster lose a few turns [It may be located right on
the handlebars at the shifters or where the cable meets the derailleur or both] to make the cable more taut until optimal shift performance is achieved. I like using the ones on the handlebar as I can make the adjustments while riding and test them by shifting. "Jay - BFri Commuter" wrote in message . .. 30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? I would rather not bring the bike back to the shop, because he has a real attitude during their busy season. I have noticed that he is a lot friendlier when I ask for the same service in February (I commute year 'round in Chicago) - TIA - J. |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
On Apr 28, 8:59 pm, landotter wrote:
On Apr 28, 5:36 pm, "Jay - BFri Commuter" wrote: 30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? Yes. Or the one where the cable enters the derailleur. FWIW, the cable didn't literally stretch. Instead, the various curves and endpoints of the cable and housing just settled into their final positions, and that created a little more slack in the system. It's a pretty common thing, and it's very easy to fix. Turn the barrel adjuster till the jockey wheel of the derailleur is perfectly under the selected cog. It's not difficult. My hunches are that you'll need a half turn counterclockwise. Yes - although "counterclockwise" depends which end you're looking from! You want to turn the adjuster in the direction that would unscrew it from whatever it's screwed into. That's counterclockwise if you're looking from the cable side of the adjuster. BTW, I wouldn't march into the shop and act angry. IMO, the mechanic's only sin was to forget to tell you that this adjustment might be necessary. - Frank Krygowski |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
"Jay - BFri Commuter" wrote in message
. .. 30 miles ago, my LBS installed a new shifter and rear derailleur cable. As I rode away from the shop, the shifting was fine. 30 miles hence, I need to go too far and then come back. So I suspect the new cable has stretched. What is the best way to tweak this? Turn the barrel shifter on the handle bars? I would rather not bring the bike back to the shop, because he has a real attitude during their busy season. I have noticed that he is a lot friendlier when I ask for the same service in February (I commute year 'round in Chicago) - TIA - J. Thanks much guys, I had a similar problem a few months back, and turning the barrel adjuster at the handlebars counter-clockwise restored normal shifting while on the repair stand, but the problem came back after riding a couple days later. I think it came back because the cable housing on my folder was visibly damaged in a couple places, from when I carelessly pinched it in the kickstand when folding it. So there was more friction. The housing and inner wire has since been replaced. Also, the cable is now routed above the BB. (Previously, it was below.) This allows for a more generous loop at the R derailleur, which Park says is a good idea. I have been able to successfully replace (upgrade) my side-pull V-type brakes (Avid Ultimate) and brake levers, check out my BB (did not need replacing), stuff like that, with the help of you bike experts. Much of what I have learned has been gleaned from lurking, rather than authoring my own posts. I think replacing my chain at the .75% wear point is the most important self-maintenance one can do for a bike. Much like car oil changes. But derailleurs and shifters remain a mystery to me. For me, it makes sense to have my LBS do that work. Aside: Watching the NFL Draft on ESPN as I write this. Anyone else think that the best thing about watching coverage of the late draft rounds is the ESPN spots of those fake news conferences? They crack me up, even if I have seen them before. Especially the Ditka one, where he seems to have a brain cramp at one point. And Suzie K is not hard to look at - J. |
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
BTW, I wouldn't march into the shop and act angry. IMO, the
mechanic's only sin was to forget to tell you that this adjustment might be necessary. After 30 miles? Hmm. (BTW, who said to march in and act angry?) Actually, if it were going to happen at all, it would likely happen fairly quickly. One tries to pre-stress the system as much as possible, but newer Shimano drivetrains don't allow you to apply as much pressure to the cable (by trying to overshift) as you used to be able to do. By the way, I'm told that cables don't actually stretch much at all. Most of the effect apparently comes from compression of the cable housing, along with any seating of ferrules onto the ends of the housings. This implies that you'd have almost no issue at all if you replaced just the cables and not the housing, but I haven't tested this to find out if it's true (since generally, by the time the gear cables need replacement, the housing does too). --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#9
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
Mike Jacoubowsky wrote:
BTW, I wouldn't march into the shop and act angry. IMO, the mechanic's only sin was to forget to tell you that this adjustment might be necessary. After 30 miles? Hmm. (BTW, who said to march in and act angry?) Actually, if it were going to happen at all, it would likely happen fairly quickly. One tries to pre-stress the system as much as possible, but newer Shimano drivetrains don't allow you to apply as much pressure to the cable (by trying to overshift) as you used to be able to do. By the way, I'm told that cables don't actually stretch much at all. Most of the effect apparently comes from compression of the cable housing, along with any seating of ferrules onto the ends of the housings. This implies that you'd have almost no issue at all if you replaced just the cables and not the housing, but I haven't tested this to find out if it's true (since generally, by the time the gear cables need replacement, the housing does too). Well, I suppose the mechanic could have not-quite-seated a ferrule and adjusted the shifting, and then when it did snuggle in place the shifting would be off abit? Still sounds like he should take it back since he just paid to have a fair amount of work done (per OP); would take all of five minutes to square it away. (Of course. once the OP learns how to do some stuff himself, then he'll just fix it.) |
#10
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Newbie Q: New Shifter and R Derailleur Cable Installed - Cable Stretch?
Well, I suppose the mechanic could have not-quite-seated a ferrule and
adjusted the shifting, and then when it did snuggle in place the shifting would be off abit? Still sounds like he should take it back since he just paid to have a fair amount of work done (per OP); would take all of five minutes to square it away. (Of course. once the OP learns how to do some stuff himself, then he'll just fix it.) Absolutely agree that, if it's not too inconvenient, it should be taken back to the shop that did the work. If the shop has the sort of attitude about such things that you wouldn't want to do so, I'd find a different shop. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com "Bill Sornson" wrote in message ... Mike Jacoubowsky wrote: BTW, I wouldn't march into the shop and act angry. IMO, the mechanic's only sin was to forget to tell you that this adjustment might be necessary. After 30 miles? Hmm. (BTW, who said to march in and act angry?) Actually, if it were going to happen at all, it would likely happen fairly quickly. One tries to pre-stress the system as much as possible, but newer Shimano drivetrains don't allow you to apply as much pressure to the cable (by trying to overshift) as you used to be able to do. By the way, I'm told that cables don't actually stretch much at all. Most of the effect apparently comes from compression of the cable housing, along with any seating of ferrules onto the ends of the housings. This implies that you'd have almost no issue at all if you replaced just the cables and not the housing, but I haven't tested this to find out if it's true (since generally, by the time the gear cables need replacement, the housing does too). Well, I suppose the mechanic could have not-quite-seated a ferrule and adjusted the shifting, and then when it did snuggle in place the shifting would be off abit? Still sounds like he should take it back since he just paid to have a fair amount of work done (per OP); would take all of five minutes to square it away. (Of course. once the OP learns how to do some stuff himself, then he'll just fix it.) |
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