Yep, when I look at it now and ignore the channel (I'm friction-shifting in the front; I have no reason to follow an STI-intended cable path), I see what effect routing over the nubby-thingy will have; it'll change the angle of the cable's path to the mechanism in such a way, it appears, that would lower the amount of derailer travel for a given amount of cable pull-or-release, "slowing" the shifting. I certainly see no downside there. When I shift in front, deliberate and controlled are much more important than fast. And a big reason I prefer friction shifting in the front is to be able to "trim" the chain angle; being able to do that with more precision is also a plus.
It might even reduce/eliminate the interference that inspired this thread in the first place. Before-and-after pictures (*good* ones this time) to follow. Thanks, William. Yours, Thomas Lynn Skean On Jul 16, 2010, at 6:24 PM, William <[email protected]> wrote: > No 180 bends. Just over the knub and over the bolt and tighten. Just > like in the picture. If there is a channel that appears to run under > the knub thing, that is the alternate routing for STI and a triple. > > On Jul 16, 3:47 pm, Thomas Lynn Skean <[email protected]> > wrote: >> Thanks for that info, William. I'll look at it again tonight. >> >> Any idea what role that channel is supposed to play? My vague recollection >> is that I'll need to bend the cable 180 degrees to go over the nub and >> through the channel. If so, that seems "harsh" somehow. >> >> Yours, >> Thomas Lynn Skean >> >> On Jul 16, 2010, at 4:59 PM, William <[email protected]> wrote: >> >>> Here's the photo of the cable routed correctly on a not-identical >>> derailleur. >> >>> http://softsolder.files.wordpress.com/2009/07/dsc03170-front-deraille... >> >>> On Jul 16, 2:57 pm, William <[email protected]> wrote: >>>> I agree it's not a problem, but from your photos it does appear that >>>> you have your cable routed wrong. >> >>>> In that third photo, the anchor bolt thread into the derailleur arm. >>>> On the arm is a bump, an appendage, a knubby thing. The cable is >>>> supposed to wrap OVER that knubby thing. From the picture, it looks >>>> like you have it neatly tucked UNDER that knubby thing. >> >>>> With the cable routed the way you appear to have it, a couple things >>>> are going to happen. The potentially good thing is that your shifting >>>> will feel faster. The derailleur will move farther with a smaller >>>> move of the shiftlever. The bad things are twofold. One is you are >>>> putting more bending strain on the cable routed that way, so it will >>>> fail sooner. Whether sooner is 9 years instead of 10, or 1 year >>>> instead of 10 is hard to predict. The second thing is that with the >>>> faster moving derailleur geometry, it's trickier to trim out the rubs >>>> with delicate shifter moves. >> >>>> I recommend you confirm that the cable is routed correctly, completely >>>> independent of whether it touches that cylinder. >> >>>> On Jul 16, 2:41 pm, Thomas Lynn Skean <[email protected]> >>>> wrote: >> >>>>> Here are really grainy photos of my setup: >> >>>>> http://home.comcast.net/~thomaslynnskean/site/?/photos/ >> >>>>> first picture is when the chain is on the middle chain ring, (barely) >>>>> showing the cable straight and clear >> >>>>> second picture is when the chain is on the inner chain ring, (barely) >>>>> showing the cable bending around the black cylinder >> >>>>> third picture is simply showing how the cable is anchored, which is >>>>> apparently the way the derailer intends to have the cable anchored, in >>>>> that there is a slight "channel" under where the anchor bolt squeezes >>>>> and the cable is lined up with it >> >>>>> As I say, the interference appears to affect nothing. So (especially >>>>> knowing that the black cylinder need not roll at all) I'm fine with it >>>>> as it is. And that's good, because I can't see that I can avoid the >>>>> interference. >> >>>>> Thanks for helping me look into this! >> >>>>> Yours, >>>>> Thomas Lynn Skean >> >>>>> On Jul 15, 8:36 pm, Ginz <[email protected]> wrote: >> >>>>>> I had a look and, yes, my cable touches the black cylinder as well. >>>>>> I, too, find it a bit odd but seems harmless. >> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "RBW Owners Bunch" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group >>> athttp://groups.google.com/group/rbw-owners-bunch?hl=en. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
