Steve's suggestion here makes sense (for once!). I shift what are, in effect, 9 speed cogs with Silver bar end shifters and had to learn the hard way -- ie, by suffering ghost shifts, particularly in one or two cogs -- before I realized that I had to move the shifter *just* enough for the ramps and hooks to catch, and then wait until they dragged the chain onto the next cog; this instead of trying to essentially overshift and then move the lever back a bit as I am accustomed to do with non H-G cogs and for wider spaced H-G cogs. Once I learned to be patient and let the H-G system do its thing, I had no more shifting problems.
One other thing: I've also found that a newly installed -- and therefor tight and skipping -- link can elude even careful visual inspection. I've often had to use my fingers as I rotated the chain backward to identify a stiff link causing skipping. (PS: Steve; psssstt!! Contact me off list and I'll tell you what gloriously crude tools and wild method I just used to remove certain non-essential braze ons from one of my Riv customs!) On Mon, Jul 9, 2012 at 5:02 AM, Steve Palincsar <palin...@his.com> wrote: > I wonder if the problem was initially mid-described. Perhaps it's not > "slipping" at all, perhaps it's what many of us have long called "ghost > shifting." > > Zack is friction-shifting Hyperglide 9. Hyperglide is designed to let > the chain sit on 2 adjacent sprockets at the same time without > clattering. Indexing can be tuned to make the shift perfectly; with > friction shifting you are dependent on auditory feedback to align the > chain, and it's largely absent. > > So what does this mean in practice? My experience friction shifting > Hyperglide 8 was that I'd downshift approaching a light or stop sign, > and thought I was correctly aligned. I'd stop, and when loading up the > drive train on start-up, the bike would upshift with a BANG. > > I switched that bike to index shift levers and all is well. I moved the > friction shifters to a bike running Hyperglide 7 and all is well there. > 7 is spaced wider, i.e., the sprockets are farther apart from each > other, making it easier to align the chain. > > I also discovered something entirely counter-intuitive and counter to > long established "old timey" practice. In the old days, when you > downshifted you relieved pedal pressure on the drive train. That made > shifting much easier. What I found with Hyperglide is that if you load > the drive train, i.e., put pressure on the pedals, the downshift becomes > snappier and more positive, engaging the next sprocket with a clunk. > > On Sun, 2012-07-08 at 20:33 -0700, rob markwardt wrote: >> Late to the party. My new bike has a 105 long-cage on back, Silver >> friction shifters, and an 11-30 8 speed cassette (46-30 rings up >> front). Shifting is perfecto in all gears. >> >> On Jul 7, 7:45 pm, Zack <zack...@gmail.com> wrote: >> > I am currently trying to eliminate a truly annoying chain slip on my >> > new-to-me 62 Hunq, and it occurred to me that I am using a new-to-me >> > derailer, and that could be causing the problem. >> > >> > Should it cause me a problem? >> > >> > I have the sugino triple crank, and the standard riv 8 speed cassette >> > 11-32. >> > >> > The derailer is a Shimano 105. I checked the range of the derailer when I >> > set it up, it flexes out to the biggest ring on the cassette and is lined >> > up to the smallest. Derailer hanger is not bent, also checked. Greased >> > underneath the bottom bracket where the cables go through the cable guide. >> > Silver shifters are beeswaxed and tightened. No apparent sticky link (i >> > checked by paying close attention to the chain running through the RD, >> > nothing was jumpy/weird). >> > >> > Slipping occurs under load, probably either in the middle or small >> > chainring, happens when I stand up and try and crank (i am about 230 lbs). >> > >> > Help appreciated. >> > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > To unsubscribe from this group, send email to > rbw-owners-bunch+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > -- "Push back against the age as hard as it pushes against you." Flannery O'Connor ------------------------- Patrick Moore, Albuquerque, NM, USA For professional resumes, contact Patrick Moore, ACRW http://resumespecialties.com/index.html ------------------------- -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
