Thanks Philip. I'm considering this 5-speed hub for the QB:
http://www.sturmey-archer.com/products/hubs/cid/4/id/34/specs/1 If I'm reading it right, if I set this up with a 22 tooth cog in back, the lowest gear will act like that divided by .625, in other words, the lowest gear in back will act like a 35 tooth cog. Combine that with my functioning front derailleur and triple crank up front (24-36-48) and consider the gear range... ...is all of this too good to be true? -Jim W. -----Original Message----- >From: Philip Williamson <philip.william...@gmail.com> >Sent: Sep 21, 2010 11:54 PM >To: RBW Owners Bunch <rbw-owners-bunch@googlegroups.com> >Subject: [RBW] Re: Internal 3-speed QB question > >The Sturmey S3X is supposed to accept threaded freewheels as well as >splined cogs. They come in 120mm spacing, and some sexy colors (not >green). >The "Quickbeam Supertype" setup would be an S3X and a Schlumpf, of >course... > > Philip Williamson >www.biketinker.com > >On Sep 20, 10:39 pm, CycloFiend <cyclofi...@earthlink.net> wrote: >> on 9/20/10 9:45 PM, James Warren at jimcwar...@earthlink.net 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 >> cyclofi...@earthlink.net >> >> 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 rbw-owners-bu...@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. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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