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casette shifting, again
On Wed, 12 Dec 2018 21:24:57 -0500, Frank Krygowski
wrote: On 12/12/2018 5:29 PM, Theodore Heise wrote: On Wed, 12 Dec 2018 17:15:45 -0500, Frank Krygowski wrote: On 12/12/2018 4:58 PM, Emanuel Berg wrote: I thought the general problem was the cable loosed its integrity or internal strength, so it got just a bit longer, much like a bicycle chain, but enough to mess things up? The cable itself is not going to get stretched with use, if that's what you mean. That would require forces many, many times larger than what's being applied in normal operation. I think that's correct, and yet on my tandems I've sometimes seem some changes in shifting that I attribute to change in cable length--maybe more due to temperature changes than to actual physical stretching. For example, when we go out on a very warm day after having ridden in cold weather for a time, I often have to tighten the adjuster just a smidge. I think apparent increases in cable length are probably due to shifting of position of the cable inside the housing, or wear of the housing where the cable follows it through curves, or the end of the housing settling further into a housing stop. Maybe the temperature change triggers something like that? As I've mentioned, my most frequent index shifting adjustment happens with my folding bike, especially if its sat folded for a while. I've learned it's easiest to just change the levers to friction mode for a while, then re-try the index mode. Somehow, most of the misadjustment corrects itself - I guess by the cables settling into their old equilibrium position. I'm pretty sure that if it were feasible to run the shift cable through a straight, rigid tube all the way from shifter to derailleur, I'd never see that problem. If you are going to use rigid tubes why not a rod? Similar to the old rod operated brakes. :-) cheers, John B. |
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