Jim: FWIW the SRAM S7 and P5 have narrower spacing, and I believe you may tweak the spacers to fit a 120mm (but not sure); I built up a P5 wheel for my wife's 1985 Stumpjumper, which has 126mm rear spacing. Nice hub, although a bit spendy and not the easiest to find, whereas there seems to be an abundance of older Sturmey Archer 3-speed hubs.
Good luck!! BB On Sep 21, 9:40 am, James Warren <[email protected]> wrote: > Thanks Jim. That helps a lot. I think I saw a narrow-spaced Shimano on their > site. I know I ran across the Shimano 3-speed type made for coaster brakes a > lot. Sure coasting good, but coaster brakes - no. I haven't looked into > Sturmey Archer yet, but I will. > > I like the bolt-on derailleur hanger from Loose Screws. Even though I already > have one of those hanger-not-needed derailleurs mounted in the frame, I might > try that hanger. > > I'll post photos when I finally get this thing going. I was hoping to have it > by October 2, but that's a longshot. > > -Jim W. > > > > -----Original Message----- > >From: CycloFiend <[email protected]> > >Sent: Sep 20, 2010 10:39 PM > >To: [email protected] > >Subject: Re: [RBW] Internal 3-speed QB question > > >on 9/20/10 9:45 PM, James Warren at [email protected] wrote: > >> I'm looking for information on Shimano 3-speed internal hubs with the > >> following idea in mind. In the following pictures: > > >>http://www.cyclofiend.com/Images/rbw/rr36_pg27.jpg > > >> the rear derailleur shown is not functioning as a rear derailleur. There > >> is no > >> cable attached, and the derailleur is only there to take up a lot of slack > >> so > >> that I can have vastly different chainrings up front shifted with a front > >> derailleur. Right now, the bike has three rings in front, 24-36-48, so the > >> bike has three gears total. (In the photo, there are two gears with a > >> pants-guard. This set-up has worked fine whether as a 1-speed or 2.) > >> What I would like to do is get a bit of gear-shifting in the back through > >> use > >> of an internal 3-speed hub. I would like to make the bike an internal > >> shifter > >> in the rear but still retain its 3-chainring derailleur system in the > >> front, > >> for a total of 9 gears (3x3). Is there any reason that I couldn't use an > >> internal 3-speed hub, like Shimano's, but while using this hub, still have > >> it > >> work with the dummy derailleur mounted as shown in the photos so that it > >> takes > >> up slack and allows me to still do wide range shifting in front? > > >> I realize this is a bit complicated (due to rear spacing and lack of > >> derailleur hanger in rear) and I'm trying to research it myself, but any > >> pointers would be appreciated if it's not too much trouble. > > >You've already done most of the heavy lifting on that system. > > >Since you are sticking with a coastable setup, there shouldn't really be > >that much of an issue. You really just have the same setup, with differing > >ratios which don't change any chain tension or angle. > > >There is the spacing issue - 120 mm, which may nix the Shimano 3 speed (and > >I think those were coaster brake models, but I'm not sure). But, S-A stuff > >can be found that way, to be sure. There's probably no reason you couldn't > >run a 7 or 8 speed hub, if it was spaced correctly. > > >It would be problematic to run the derailleur with a fixed hub like the S-A > >S3X. Derailleurs/tensioning devices and fixed setups are generally thought > >to be Bad Ideas. AASHTA - > >http://www.sheldonbrown.com/singlespeed.html#tension > > >You're really just using the arm of the rear derailleur for tension. And > >for the range you are running, I don't think you could drop back to a Paul > >Melvin. But, if you widen your gearing aft, maybe you could run narrower up > >front... > > >(For those looking to mount a derailleur on a tab-less fork end, you just > >need to find one of these - http://tinyurl.com/derhanger) > > >It seems like you are really most of the way there, right now. > > >- Jim > > >-- > >Jim Edgar > >[email protected] > > >Cyclofiend Bicycle Photo Galleries -http://www.cyclofiend.com > >Current Classics - Cross Bikes > >Singlespeed - Working Bikes > > >Gallery updates now appear here -http://cyclofiend.blogspot.com > > >"Maybe a bike, once discarded, pines away year after year for the first hand > >that steered it, and as it grows old it dreams, in its bike way, of the > >young roads." > > >-- Robert McCammon, "Boy's Life" > > >-- > >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.- Hide quoted text - > > - Show quoted text - -- 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.
