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 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.
